This was found 2 days after XL came out by @The Magician hoping he'd like the game again, but since he stopped playing anyway he never made it available. So here we are 3 months later finally revealing it.
The problem is that with the phase. If ur opponent knows the matchup and catches u trying to do non ex phase, u can be grabbed out of it at startup and opponent can neutral jump over it and potentially stuff u badly which is another option. Same with ex version only now Smoke can't be grabbed out and there's no guaranteed pressure unless u desperately need to get out the corner. This is just what I've noticed from playing against Smoke the past few weeks or so