sdfgjdfgkhklfgdjfkMedic attach speed stuff
I think your argument centering around medic attach speed making the game more aggressive doesn't quite take into account a few things. The way attach speed currently works incentivizes something I call "half committing" where meds and scouts tend to play a lot safer in fights than they would pre attach speed which often ends up hurting coordinated aggression (this is particularly noticable on mids like process). This is because they know that with this positioning they have a guarantee of getting out and preserving uber if the fight goes poorly. I think this is more what fucks soldier in the current meta than "medics heal scouts more", it's just that it provides more of an incentive for their team to bait them and changes their class role to be more throwaway.
If you watch older TF2, you'll notice meds will bail on mid far earlier than they would now if they smell things going badly. You need to do this to have a guarantee of getting out when you don't have attach speed. You might think that this would make the game far more passive, but the thing is that having to bail this early means that you're almost certainly baiting your team for a loss, so it has much larger consequences. Also, you'd see meds and scouts commit a lot more in fights because there's no guarantee they're getting out otherwise, so it's optimal to get your team as healthy as possible. Basically, if you can't guarantee your medic living it's less optimal to play around doing so.
sdfgjdfgkhklfgdjfkslowing down the meta that we’ve been happy playing for 5 years and limiting our options for plays seems so pointless
I'd also just like to point out that I've not been happy playing the meta for almost exactly 5 years and that the 2015 meta was probably when TF2 felt the most fun both to watch and play. It's not just playing soldier either, I think scout and medic became far less fun after the change compared to soldier which only became moderately less fun. I will say that we're definitely in a better place than we were a couple of years after the change, but I still think what we're playing currently needs shaking up badly.