I like both Back to Block and Block Button
What I don't understand is how people who want good walk speeds in NRS games can bash back to block. Back to block directly works WITH good walk speeds. With a good walk speed you can bait and control space by walking in, taking a step back, walking in again.
As far as cross-ups in FGs go, I don't see them as scrubby at all. For one thing, if someone is jumping at you in a B2B game, you STILL have the option to anti-air them. That doesn't change simply because you can't hit a button to block. Also, if you're knocked down and someone is jumping at you, you could still do a roll or a wake-up attack depending on the game to defend yourself. Of course, some games have more complicated defense systems and gauges that fill up if you block too long, but the core concepts remain the same.
To me, back to block forces the opponent to commit to a read, where as with a block button it always felt to me as your options were covered.
Of course, with a block button you still had to fuzzy high/low mix-ups, just as you would with back to block.
Maybe I'm just a filthy casual, but I never felt like they were THAT different from each other or that hard to adapt to, outside of Back to Block working better with walking movement and forcing you to make reads more.
But that's just my opinion.