the biggest problem is just that scout has the highest skill ceiling and the progression in skill just doesn't really line up
people tend to forget that it was only 5 years back that scouts started to actually leave the ground, when I first started (2009 boomer player) the attitude was 100% that double jumping was shit because it was predictable and you were just dead if you did that. I used to get told off by teamleaders for practicing my movement in surf even in 2012/3 because it was just seen as pointless
2015 there were still plenty of mid level scouts that couldn't even airstrafe in europe, which is completely unimaginable now but that is the reality. It wasn't even considered weird. That's not even to say how much aim has improved.
nowadays I'm shocked regularly the way scouts spin around or stop midair as the rocket comes out, while killing you in 3 shots maximum, purely because the difference between now and when I started is night and day.
meanwhile soldier, although everyone has of course gotten way better, the level of movement of everyone and especially medics and demos has gone up so severely. in about 2015 there were pretty much no medics outside of prem who could even really surf properly and a basic surf nowadays was seen as pretty special stuff
and although the rocket aim has of course gotten much better, the jumps haven't, purely because soldiers always gonna be limited by those 4 rockets. even back then forsaken was doing the speedshot bombs on gully, so because of that it just gets harder and harder to actually get onto the target to use the hard aim action, as the jump map jump progression just isn't real game viable most of the time
just my opinion though