[Galaxy Tab 4 General] :
No offence taken on the firmware post, I was simply trying to spread the fact that the firmware for the device does exist but is very hard to find and is often posted on shady websites for money, unless you're looking in the right places. It only took me 5 minutes on Google to find one of those sites.

You asked if I was saying that the Tab 4 BOH4 firmware allows you to retain permanent root after some time, and yes, that's exactly what I was saying. I rooted my tablet with Kingroot 4.8.0 a while back and after about 4 - 5 reboots (I counted how many times I rebooted it, but the numbers could vary), It retained root. All I do today is avoid rebooting the tablet at all costs. I prefer SuperSU because, like we've said, there are almost no limitations of what you can do in terms of being rooted. I'm trying to find out how I can make root permanent on the tab with SuperSU by using the eng-boot method used to root all Qualcomm variants of the Galaxy S7, but that may take a while. Since my S7 has the eng-boot root method, I can reboot it all I want and it stays rooted with SuperSU. But at this point, It's just an Idea. I mainly need to find out whether or not the bootloader or the os is wiping the binaries on boot. Some older and newer versions of kingroot can retain root after reboot, but I have yet to find a version of the app that can do so.

Actually, some versions of Cyanogenmod and other custom roms had root pre-installed (not like SuperSU, but close enough), and like CM specifically, there was a section in the settings app for this pre-baked root. Even if I still used CM today, I still would've flashed SuperSU. But on a small number of devices, temp root really is better. However, most of those devices that would be on that list have very little to no development on them. Thus, they are not yet (and may never be) supported for permanent root.

I am partially on the road to becoming a developer, but I don't know how far that's gonna go (my prediction is not that far at all). I was doing research on how I could make an eng-boot for the Tab 4, but I became interested in my Galaxy S7 (AT&T). By that, I mean I wanted to make my own custom version of the stock Marshmallow rom ("Custom but stock OS"). To shorten it up, I wanted to create a .zip flashable "super package" which included SuperSU v2.79, Viper4Android, Overclock tools, and other stuff. I've kinda been on and off in terms of motivation to make this idea a reality, primarily because most of the things I wanted to include in this "package", can easily be installed by you in like 3 minutes, or maybe less. The original motive behind the idea was to lessen the work for power users who wanted to free their device "from the shackles". I've been on and off on work between both devices, but It's hard for me to continue the work without proper motivation. These projects are merely just an Idea at this point, but some drafts and copies do exist on my computer.

Creating a custom Android rom straight from my own head is basically an impossible task for me, considering most of the devices I work with have locked bootloaders. I am still learning Java and other Android programming languages in some of my free time but, again, the motivation to continue is something I struggle to find.

Cheers!