Do you think he is only higher mid tier without tele cancel?
Searing Rage still has the "sick" footsies play - and a bit more damage potential (in certain match ups the spear moves are legit stuff).
Tip for F34 kb: use kb activation for button. You do not have to use it for the first opportunity.
Without KB it is a good info to know if he is mashing or not. You can use that info to risk an F32 too lol.
Other than that I agree that tele cancel gives him more freedom on the field.
But I played Scorpion who just "overused" that tele cancel and I did not believe in his real teleport anymore: he was punished by reaction (to the teleport not to the cancel). I do not know if tele cancel can be reacted AND punished properly. I tried reacting tele cancel into 21 but I was late with D1 (it was 160 ping though).
So for the real mixup you need to do real teleports as well. Which is a big risk.
But even with that risk the risk reward is probably in Scorpion's favor.
Using tele cancel to get in and/or mix is personal preference.
I rather play real footsies. But tele cancel can support it too.
I do not play Reborn yet to not getting lazy with footsies but improve. And teleport still helps a lot as makes whiff punishing much easier in certain cases.
But I do not go to tournament to optimize stuff.
After Scorpion I struggle a bit with other characters in footsies but it is probably I just did not play too much with them.
Or just missing the good footsie tools.