Okay, to clarify my point in a more simplistic fashion:
Most of us could make better looking art, much faster, with some little airbrushes and a little Photoshoppng. We choose not to. We do things the "hard" way.
Likewise, I could get things done slightly faster (at the cost of losing some accessability and spending time getting over a learning curve) with another program, but I choose not to. I do things the hard way.
Musicians would complain about me using FruityLoops to make music. Real "physical" artists would complain about my use of school pencils on printer paper. Pixel artists complain about me using Paint instead of ProMotion or whatever. But they're all minor hobbies in the major pie that is my life, and I don't think it's worth making any of them more complicated than they currently are, so I stick with what I know for as long as it works, and as far as I can tell, MS Paint will never stop working for pixel art. Unless, maybe, if I start working professionally with it. But that's not something I want to do currently, so I see no reason to adapt to that.