Smoke is already pretty safe for the most part when it comes to his strings and stuff. It's just canceling to sb. Once people know EVERYTHING into sb on block can be blown up except 114 (which has a gap anyways), that's when it's gonna get annoying.
Some strings into phase can be blown up to. I know 21 Phase is completely safe tho.
On a different note, can we talk about how dirty f21 is?
F21- I agree. The fact that you can slightly delay the 3 ender or Tele/EX Tele is pretty good, IMO. And F213 is safe, plus leads to a very advantageous HKD. Good range. The animation itself can play mind games.
Something I worked on before work this morning (for maybe 15 minutes- not a huge lab session, unf.) was F21 into Smoke Away/Forward, and the EX Phase, too. I think it creates a pretty good opportunity to cause the opponent to panic and whiff a move/armor, especially if they want to armor the gap. Of course using normal Phase is a risk, but I don't think it shouldn't be used once in a while.
I just tested against SG Kotal, with EX Cmd grab as a reversal, and F21-normal Phase Away allowed me to whiff punish him. Phase Forward- the cmd grab auto corrected and got me. A few times I slightly delayed the Phase Forward and wasn't grabbed, but the timing was very tricky. Wasn't consistent.
EX Phasing, I didn't have time to mess with against Kotal.
Obvi, a Smoke player would have to lab this strategy extensively, due to the amount of reversals in the game, but it is something. And honestly, a strong gimmick this early on.