I guess different people have different ways to play the same game. Happens in every sport/game, not everyone plays the same way.
I've seen several teams that like to play the aggro role, not letting the other team take a break for a moment and constantly pushing on small advantages or creating ones outta nowhere. I've seen less teams doing the "let's piss them off strat" (or counter-attacking). How's that? you get the advantage, for that you need to be the aggressive team, then you piss the other team off. Eventually the other team will get impatient and attack, make a mistake, and they counter-attack on that, and thus winning the round or at least some ground. (I think that's what Kaneco tried to explain with the Chelsea and Mourinho analogy, his teams always play this way)
Is it annoying for defending team? Yes. Is it boring to watch? Yup, probably not a lot of people would like to see that. Is it a valid strategy? If it gives you results you can't really say it's not.
Basketball forces you to attack due to the shot clock, in tf2 there's no such thing as that. If I’m 2-0 up, and in control of the middle point, do I really have to push and take 2nd? Depending on how you see the game, how comfortable you feel taking certain role or what's your playstyle and general strategy, the answer will be either yes or no.
From what I got from that video is that you just don't like stalemates Slin, because in your 4 years of tf2 experience at a comp level you learnt how to play the game a certain way that encourages you to NOT create those situations, and when you find someone that has a different way to play the same game we all love it conflicts with your knowledge, creating this frustration you had at that moment.