Yeah, I still play these regularly even after all these years and I just figured this was all common knowledge since it's so obvious. The better you get though, the less of an advantage it is for the CPU and it's more of a "I got robbed of a perfect" scenario. Speaking strictly of Street Fighter 2 and on of course (with the exception being SSF2T). I think the "no charge for charge moves" is the one most people, even somewhat casual players, probably pick up on first.
My memory is a little fuzzy, but I actually think I recall the Genesis and SNES Street Fighter 2, Guile in particular, abusing the no-charge-needed advantage more than even the arcade; you leave the ground for any reason within his vicinity and 99.9% of the time he has an instant flash kick for you. All adaptable nonsense for sure, but weird that the home version would be more cheap in that regard than the pay to play arcade. Again, it's been a while since I played those versions, so I don't know if they were all like that, but I do recall that at least one of them was hilariously overboard with that kind of thing. I will say though, that in it's defense it taught the teenage me to develop a stronger ground game which I took back to the arcade so it's not all bad.
The CPU for the USA release of Super Street Fighter 2 Turbo though.....I really have to be in the mood to go through a run of that; it's more work than fun and even when you finish it, the victory is kind of hollow because you know you just spent however long it takes just simply putting up with nonstop bullshit rather than outplaying the CPU. I just find it exhausting and prefer playing that one specifically with other players. I also think it's shit that it's the SSF2T rom that they chose for the SF 30th collection.
Mortal Kombat 1,2 & 3s CPU was much more unfair imo. You could literally do nothing against it
100% agree. I mean, I like them (though not as much as SF) but the CPU in the first three MK games is just a straight bullshit artist. It has noticeable peaks and valleys too: do really good and it gets more and more cheap to where it's obvious you can't do anything. Lose enough and it's like it "calms down" but for how long depends on how high on the ladder you are, it can be just for one round, to one entire fight, but once you win that fight, it comes raging back with a fury.