There needs to be a penalty for speed and agaility ASAP

Yeah, I've thought about this topic a lot as well. There's a reason why the majority of competitive 6s/3s players are running some variation of a 5'7 or 6'0 skater, depending on whether they're using sniper/playmaker/dangler or puck-moving defenseman, at around 160 lbs with gold elite edges. It's simply the best build in the game and completely outclasses the other builds.

There are times in the game where if you go into a 6s/3s lobby with a build that isn't as I described previously, you'll straight up get kicked from the lobby. It's to the point where if I want to play a larger, more defense oriented build on defense, I gotta equip my pmd speed build before entering the lobby, then change my loadout once we've matched up with another team (can't be kicked at that point).

But, honestly, that doesn't happen too often because I pretty much never use any build that isn't a smaller, speedy, agile build. In my experience, you can't afford to use a bigger defensive build because you can't afford to lose the track meet against the forwards who are all at 94-95 speed and super agile.