Pyro needs his airblast reworked a little bit...
The big one is that your reflections are absolutely ruined if a teammate is clipping you. They will shoot in all kinds of wacky directions, including your face. Too many unintentional suicides while trying to save a teammate from a projectile, that shouldn't happen...
I think some projectiles still minicrit Pyro when reflected. Pills I believe are the main culprit, but this may have been fixed.
Also, the way airblast controls movement is a bit too easy right now. I believe it use to work in conjuction more with whatever your victim's current movement is, so they could still surf airblast a bit, but now it seems to reset their movement entirely. If airblast could work a bit like explosive knockback, that would really help. There's no reason a rocket jumping soldier going 999 hammer units per second or w/e should have their movement entirely reset when a Pyro airblasts them in the same direction they were already going. It feels counter-intuitive and it makes airblast too much of an aim assistant and crutch.
Also, the heavy nerfs were very dumb. Let's not forget those.
What if calling for Medic temporarily put a little marker above nearby Medic's heads so you can much more quickly find your combo? Duh, people should be able to keep up with where their combo is and communicate but if we're putting these formats in the hands of the general population... might be useful. Nothing worse than a lobby with a Medic who won't communicate and doesn't know the map / strats. Speaking of which, Medic probably needs a bit more incentive to play in these formats. Getting a Medic on both teams is always the hardest thing about starting a lobby. Maybe not a gameplay change, but perhaps Medic can help your ranking more than other classes, IDK.