I've been cubing for a couple of years now, so I'm quite familiar with all the various finger tricks and different ways to move faces and slices. Most of the ones I came up with when I started were natural and intuitive and fell inline with the accepted standard. I have ditched a few in favor of more efficient ones and adopted some handy ones that I never thought of on my own.
One of them still bothers me though: I initially started doing M slices (rotating the middle vertical slice towards you) with my thumb (either left or right, depending on context), placing it on the UF edge piece and pulling down.
All techniques I have found say to do it with the middle or ring finger, placing it on the DB edge and pushing up, but this feels way more awkward and less intuitive. (I do M' and M2 moves as normal, placing ring/middle on DB and pulling under the cube toward the front.) There are actually a number of M slice algs that people avoid because they are awkward and slow, but I find them fluid and efficient using my thumb for M moves.
There is no way I'm the only one to think of this. Surely there have been plenty of experienced cubers that discovered both ways and decided for whatever reason that pushing up from the back was better then pulling down from the front.
So is there something I'm missing here? Are thumb M moves bad for some reason? Is this actually a thing and I have somehow just missed every single reference to it?