dokidokipanici think part of this can be attributed to american tf2 and the amount of time players have per match. if there was less time per map, there would be more of a reason to play faster if not more aggressively. Europe has been doing that in comparison to NA but maybe it could be worth it to have even less than 30 minutes on a map.
if you're down a round, then yeah you have to. up a round? park the bus. you can eat up to 1/3 of the ENTIRE MATCH by sitting on one point and refusing to push. that would just amplify with an even shorter match time.
if there's big money on the line: no matter what the ruleset is once a team gains an advantage (a round, won mid, etc) they're going to play as safely as they can. if they're up a round expect them to sit on mid forever. if they've won mid expect them to play insanely far back and send in 1 suicide who can either off class or just go suicide again until it works.