With someone was stupid enough to go spy when we already have 3 then losing isn't going to make that person smarter but by inserting controls and safeties into the game we can make sure retards don't ruin it.
Actually, that's exactly how (average) players learn that too many of one class is detrimental to their team. a 7-8 minute steamroll will end up bucking players up and force a team scramble.
And again, Mar, you make several assumptions. You assume that the map is 5cp push. I'll garauntee any A/D defence without a heavy medic combo flops. The same goes for offense, where there could be up to 3 heavies. Ignoring all game modes other than cp to justify imbalance for comps makes for a very poor arguement.
Lets say your team pulls a "focus fire" on a heavy. You now have a whole team with no ammo. A pyro flanks you and the rest push your team because you're low on ammo. Your whole team is dead. I'm just making examples here, this probably doesn't happen a lot in comp play (mostly because it's never given a chance too with class limits, but also i bring out many experiences of ctf, another game mode comp play ignores).
You can't just deny the circumstances in which these types of mechanics happen because comp play deny's playing it, and possibly end up justifying the use of the classes they currently do not approve of. They wont happen like this because there are not enough players to justify the use of specialised classes such as the heavy, pyro or engineer. You say..
The higher you go up in skill level certain things that seemed balanced no longer are.
You can't make that claim without a full team to balance the
field to see whether these classes perform effectively as they were designed too. I have just stated how imbalanced your teams classes will be on a limited number of players, so it doesn't matter how skilled your team is, these classes are already imbalanced for 6vs6 to 12vs12.
But you seemed to have completely ignored all my previous arguements and claimed i simply can't know because i havn't experienced "teamwork".
P.S. I was going to say more, particularly on game modes comp play ignores, but i have to go to work.. and although this is a slightly off topic arguement it has gleamed several insights so i don't think it should be rashly brushed under the carpet, yet.