How to deal with dm-verity on a Samsung S7 Edge when installing a custom recovery like TWRP
For a Galaxy S7 Edge it is possible to root Android 7, and 8. It just apparently takes an engineering bootloader to do so. And I don't even think it is a REAL ENG Bootloader. 

I agree with you however, most people in the XDA community that releases anything for a newer-ish samsung device gives little to zero information about what it is their files are even doing to your device.

Like seriously. Chainfire quitted working on Samsung Devices, and now all the big whig samsung devs, WILL NOT divulge their information to other devs. 

Because some of the big devs will never own my device, but I can't work on my device because other devs won't share their knowledge, "because if they aren't going to do it, then no one is", apparently.

I had a real eng firmware for the Galaxy Note 5. The same thing they used on the Galaxy S8, but all those same devs laughed at me, and then stole my idea.

I will say JRKRUSE has some good, legit files for you to use on XDA, just don't expect him to explain anything at all. He keeps all his information to himself. Kind of like the S8 devs. Always general information, nothing specific.

But so far TWRP hasn't been officially flashed to a USA Galaxy S7/Edge device. And I think it is because of TWRP itself being so configured for default AOSP Android and not Samsung Android.