Im actually surprised your trying to simplify his vortex so much considering we've agreed on the complexity of the character before , and in other threads you've said you don't even use the vortex and that you go for knockdowns, so why do you feel so strongly about how his vortex should work? Honestly there is no right or wrong way , I exclusively use the vortex and my way works great for me , even more so when my opponent knows the mu well. I think jailing strings other than b3 are useful for several reasons , conditioning being a very big one. When I'm putting people in the vortex I don't want them armoring or jumping or trying to armor out when they block b1/b3 into smoke cloud. Let me try to explain it in a flow chart kind of way.
Your playing with someone who knows the mu well , i.e. Knows they can jump out , backdash , knows when they can armor thru things etc.
you hit them with something and end in spear jip 21 - they know they are being put in the vortex.
They are thinking " I think he's gonna go for the over head , Ima backdash/armor etc. "
The way this plays out is ~
you go for the b3 and hit them and vortex.
You go for the overhead and instead of being safe with the -6 smoke cloud , you get armored or even full combo whiff punished.
That's a 50/50
But what if you use f13 and hit them for trying to armor? When the b3 hits they jus think " oh I guessed wrong "
But when you show them you have other options than jus b3/b1 they think " shit I can't armor , backdash etc. "
so the next time you loop the vortex they are a lot less likely to try and armor or anything at any point.
And on top of that f13 is 2 hits into smoke cloud as opposed to 1 hit , so when they respect that it ruins there option of armoring when they guess the b3/b4 correctly
And then there is always the odd chance that even someone with perfect timing like you might accidentally miss time the b3 and get back dashed armored etc. anyway.
Even using strings other than 21 to end can help. You can f21phase into throw , or end in f13 and jail into another f13.
As a player who uses smokes vortex for my primary gameplan I find that constantly mixing it up and making your opponent feel like his only option is to block and make them scared to press buttons is more important than just flipping a coin. I feel like just going with the b3/b1 mix up gives them more chances for opening you up than you have to open them up. They can punish you multiple ways for going overhead and multiple ways for you going low , hell they can njp you after blocking the b3 or b1.
But like I said honestly it's all about what works for the person playing.
If you don't play anyone that abuses your gaps then hey , ggs