In comparison to past games, the basics are even more universal. I personally find this to be one of the crowning changes in SC6 as you're no longer scratching your head when using a new character, trying to remember what command does a low (for example) as they are all universally 1A, 1B, 1K across all characters.
Some thoughts on what I would like to see implemented and removed when it comes to mechanics.
RE has got to go. It was a decent experiment and while it's no longer the tedious bitch it was in season 1, it's still a mini game in a competitive fighting game which is never going to match the main mechanics.
More delay attack moves. What I mean by that is having moves or strings where you hold down a button and delay the swing. Some characters in game even buff those delay attacks to a Break Attacks. This is where I think SC7 really needs to focus on. It would add tons of mind games and would allow players have more freedom with their character. I don't think I'm alone with the opinion that it's great to see players play the same character in different ways (I'm still butt mad that Taki's neutral was butchered in SC6, let alone the shit lows which makes her ridgid as fuck to play).
Make Soul Charge moves normal moves. I like SC6's Soul Charge but I don't like having moves locked behind it. Just balance them accordingly. Soul Charge already buffs moves with chip damage and there are other ways to buff moves like turning certain moves into Break Attacks, Just Frames or extend the reach of some moves while in Soul Charge (Maxi's 6A+B is a great example).
Bring back advance step guard. It would give people the option to shuffle away from an opponent who is applying pressure. No idea why this was removed.