[LG V30 Questions & Answers] ChazzMatt:
Especially for US998, nothing about Pie is "better" than the last stable Oreo. I'm on rooted Oreo with Magisk mods. US998 Pie is wonky and lots of trouble. LG never released the Open Market US998 Pie but only the U.S. Cellular US998 Pie. For people using other carriers like Verizon, some functionality is lost vs the Open Market US998 Oreo. For other Pie KDZ, it's a mixed bag.

However, if you decide to check it out and don't like it, then downgrading from Pie back to Oreo causes issues with camera, flashlight and other sensors and while there is the a workaround which mostly works, you still risk having to use permissive kernel/mode. I have this warning at the top of every Pie KDZ thread.

On stock Pie seems LG slowed the charging speed and one of our Telegram devs (who works on a stock-based Pie ROM) made a list of other stuff LG degraded in stock Pie vs stock Oreo. I just asked him to re-submit it and I'll post it here.

HOWEVER, to run AOSP/LOS-17 based ROMs you do need to install stock Pie. But I have never run a custom ROM on this phone since I bought it. In the past, since like 2010, I've had custom ROMs on every other Android phone and tablet -- and helped friends do the same. But on this phone, I kept it rooted stock with a couple of mods. Our AOSP custom ROM devs work very hard and we appreciate the developments -- but with my current job I need my phone to work at all times of the day and night. Best for me personally to run rooted stock.

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From Aeron Li, the dev for AIX (stock based Pie ROM) and AIS (stock based Oreo ROM):

The pros and cons of Stock 9 Pie for LG v30:

CONS:

- lowered the processor frequencies at 518/800 MHz instead of 300 MHz and the Adreno graphics core at 257 MHz instead of 180 MHz in the Governor Interactive scheduler, which always works out of the box by default. Changing the scheduler requires a root and specialized programs for editing CPU / GPU parameters.

The result is twofold, on the one hand, an increase in speed (vaunted smoothness of the UI, which, in principle, is achievable by slightly different, MUCH MORE HUMAN METHODS) on the other hand, is a decrease in the battery life of the device, but since Android 9 has additional means of optimizing the battery, this is not so noticeable. Consider, the life time remained almost the same, but as a result we were simply deceived, because Google promises with the transition from Oreo to Pie an improvement in battery time, but in fact we do not have this.

- Lightweight sound driver. Stock Oreo calmly supports 384kHz / 32bit sound, and if you have certain tools, you can reconfigure it to output sound with improved quality by recounting with Aqstic and QuadDAC Saber. The 9 Pie driver does not have such an opportunity.

-LG removed FULLY ANT + support from 9 Pie. These are widely used (in Europe, the USA, Korea for sure) medical and sports devices - scales, sports trackers, bicycle microcomputers, etc. Why so is a mystery to me. It's a shame.

- device performance profiles + Thermal Engine profiles. They are awful. Not only that, in conjunction with the overestimated frequencies of the scheduler, by default the phone quickly “warms up”, thanks to them it starts to throttle faster to cool off. therefore, User Expirience is getting worse.

- depending on the region, the camera is trimmed in functionality. The same CinemaMode can write video either in FHD maximum or in UHD.

- Depending on the region, the WiFi settings functionality is cut. For example, for America, settings for displaying WiFi networks by signal level are available, the ability to select the carrier frequency for connecting to dual-frequency routers (auto / 2.49 / 5GHz), it is possible to choose the priority and the WiFi zone depending on the location (home / work / street ), there is an automatic connection to specialized WiFi XT networks.

- at some regions there is no way to transfer the access point to the 5GHz band. Only 2.4 GHz mode is available.

- Gestures (yes, neutered) are implemented using the launcher and not at the level of the system framework. Of course, I don’t know whether it was Google who originally did 9 Pie this way, or whether LG tried it. But for me, this is a minus of the system.

- no AR emoticons in the selfie camera. Minus for an amateur, but still.

- There is no DTS-X implementation for speakers. Moreover, the hardware is supported by us, and the mode can even be turned on, however, due to the cut-off audio path, it simply will not work.

-No equalizer as in older models, the same G7. At the same time, if you just install the application from the older device into the system (and add some string into build.prop), it will appear in the settings and work!

-A controversial point, but for me this is a huge minus. Again, I don’t know, maybe it’s because of Android 9 Pie, or LG is to blame, there is no choice to determine the geolocation in an expanded form (GPS + A-GPS + for mobile networks / GPS / For mobile networks). In addition, VERY increased battery consumption by the item "Help search for WiFi networks to improve geolocation". The fad consumes up to 2% of the battery in 8 hours. Someone does not care, but someone cherishes literally every milliampere-hour of the battery.

- degraded HEVC decoder. Cannot normally decode HFR (High Frame Rate) videos - videos with FPS over 60 - 120/240 fps. All your slow-mo recorded in HEVC will appear with overcontrast and hue.

PROS:

- fluent UI

- more CPU/GPU performance

- Newer API, support for newer games, apps, Vulkan API

- newer security patches (last was from december' 2019 at South Korean v300 device firmware)

- better CPU utilizing for idle mode and DOZE mode

In principle, these are the main disadvantages of the drain of LG Android 9 Pie. At least what I remembered now.