[Samsung Galaxy S22] Vorion:
1. I have SD version. I used to flash Custom ROMs on all my previous phone after those stop receiving updated OS. Also for not missing out new features. Right now, with 4 years of OS guarantee by Samsung, I don't see myself going for custom ROMs on my S22. I use Magisk and a few other modules.

2. Battery life is very subjective and personal. For me, it lasts 24 hours on a single charge with 30% left before I charge it again. I don't play heavy games. I have Sudoko, Alto's Adventure, and Flappy Bird (hahaha).. Just to pass the time when I am waiting for someone or something. That's it. I save the heavy/real gaming for bigger screens and PC (for better experience)

I too had less than ideal battery endurance during the first two weeks. It's been the case for the past Samsung devices I have used. So, I knew it would improve after settling in. I resetted the phone before I manually configured the apps and transferred my old data to S22. (Painfully long process) Usually do with Titanium Backup Pro but I wanted it to be a fresh start.

On a regular day.. Connected on WIFI always. 2 SIM cards (1st 2G/3G/4G and 2nd only 2G). I use Slack with 3 different workspaces. 5 Emails on Gmail ( 3 syncing regularly), 1 Samsung account syncing, 2 more work emails syncing on Samsung Email app. Some Chrome use. FlipBoard, Pocket, and Medium reading at the end of the day. Whatsapp, Whatsapp Business, and Telegram usage. Google Drive and Sheet. A few pics here and there.

10 mins of Social media if neeeded. Sometimes music. No watching videos on a regular day. Some 30-60 mins of calls. Buds Pro and Amazfit T Rex Pro connected always.

I get 4 to 5 hours of Screen on Time with 22 to 24 hours overall usage, still with 30% battery remaining. I don't spend time outdoor during day time, so the screen doesn't have to be fully lit. Auto Brightness manages it. Biggest draw on battery for me is the video call, some 18-20% an hour. Next is the outdoor navigation for 10 mins, lost like 3-4%.

I have removed FB app, MS apps and a few Google apps. Also a few Samsung apps which I found no use for. Though I have Root, I found ADB is much easier than Root for removing/disabling these apps. 120 Hz Adaptive refresh rate on. Adaptive Battery. Add some apps to Deep Sleep. That's it. Greenify didn't seem to make a difference in my usage. So stopped.

Accubattery Stats are like.. Discharge 1% an hour on Standby and 10% an hour on screen usage (Wifi and indoors). (I have installed around 100 third party apps on this phone)

I was waiting on the sidelines for the first few months. Was waiting for Samsung to release some updates and improve the battery endurance (as usual). Online reviews were mostly negative due to their usage patterns. My usage is different from theirs. I am still little upset at Samsung for being a jerk by reducing the battery capacity instead of increasing it, just like any other greedy company. So the negative reviews are necessary to call out their wicked move. Hey, if your usage is something like mine, you can go ahead. It's not bad at all. Better battery than my S8 when it was new and 20% less efficient than my S20 FE 5G or A52.

3. I am on One UI 5.0 Stable/Rooted. So far, So good. Minor but good improvements from One UI 4.1. I am using Nova Launcher Prime.. been like this for the last 5 years. I just don't like the homescreen and app drawer arrangements on One UI. That's all. Everything else is so good. I personally love One UI for its functionality. It has evolved a lot. People complain about bloatware either have not used One UI 3 or later versions on flagship devices. Bloatwares are there in mid and low end devices, that too getting less nowadays (comparing with M12).

4. I too was tempted to try custom Kernel during the first week. But I wanted to wait and see what this device had to offer in terms of battery life. I am happy without custom kernel. Flashing Custom ROMs and kernels are just like any other Samsung phones. But I find it much easier than Moto or Xiaomi phones.

5. I replaced my S8 with S20 FE 5G and I didn't like the size. I replaced it with S22. Compactness, easy to use. Better cameras than S20 FE 5G. Average battery life. Good build. One UI is good. If I had the chance to decide again, I would still choose S22 over Pixel 7 or 7 Pro. Overall experience matters than a few extra features.

I hope this helps!

Edit: One UI 5.0 has come with a feature, Bixby Text Call - similar to Pixel's Call Screening feature. I have no use for it. I haven't tried it. Currently, the translation/transcription only supports Korean language.

Call Quality with and without Wifi Calling/VOLTE enabled, is super clear for both parties. Better than any phone I have used, even their own S8, A52, and S20 FE 5G. Even on loud speaker, I would sit a few feet away from my phone and still it would be clear to both parties without any issues. We also have inbuilt sound quality settings to tweak to our needs. I found this for the first time on One UI 4.0