NTR works with Gateshark, you're talking about manual ram editing that doesn't have to be done.
https://gbatemp.net/threads/release-gateshark2ntr.436504/
Still more complicated than Gateshark.
To use NTR:
Download and setup devkitpro
Download gateshark cheat file
Convert gateshark cheat file
Place cheat.plg on console sd card
Boot ntr
Boot game
Activate cheats
To use Gateshark:
Download gateshark cheat file
Place gateshark cheat file on gateway sd card
Boot game
Activate cheat(s)
That doesn't even begin to address finding/creating your own cheats, which is significantly easier with gateshark.
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Bottom line, the implication that NTR allows you to cheat in as simple and easy a manner as Gateway is a blatant falsehood and, as far as I can tell, one largely spread and supported by the same people who blindly spew gatehate and preach the holy wonders of plailect and a9lh.
At the end of the day, no two users have the same requirements or desires for their console. What works for you might not work for the next guy because what he wants out of the process is something different.
Luma3DS, A9LH, NTR, and Gateway are ALL extremely useful tools that are work wonderfully for the things that they set out to do. But just because A9LH is the best exploit we have seen since the console launched does NOT mean that it is the answer to every question asked about hacking. And just because NTR is free and works without extra hardware on the console itself does not mean its the answer to every question about gateway and/or cheating.