I never said that the froyo/epsi style was perfect, I just think it offers very good solutions to most of the stalemate situations that teams find themselves in now, and there's a lot to be addressed with the questions you asked and that's why it's hard to give a detailed enough answer in a forum post (it's why I won't begin to respond to #64 because there's too much to say).
One of the aspects of the current meta is that its based around plays that are very likely to just reset the stalemate (sac -> counter sac, then sniper v sniper where one gets a pick -> sac..) and there's a lot of issues with this, but the biggest one is that it gets teams into the habit of not capitalising on advantages within the timeframe to do so (aggressive tf2 is like quake because you are constantly juggling advantages in strict timeframes) and as a result there are so many wasted advantages in today's tf2, but I am of the opinion that it works best within 5cp to capitalize on every advantage you can.
There is absolutely merit to the 7 playstyle because in the ruleset we use it makes sense to pressure the enemy for time if you are in the lead (look at Inter Milan under Jose Mourinho if you want a sports example of exactly the same approach to winning) but it doesn't address capitalising on advantages to the fullest because it is an under developed playstyle - kaido said this himself, I'm paraphrasing but the point I'm making is that the 7 style isn't the definitive way to play tf2 and people are treating it like it is just because they can't beat it but that's another issue entirely.
I've said time and again that it is harder to play aggressively to the same level but I have no concern for making tf2 easier to play because I think that defeats the point of a skill based game, if you can do something your enemies can't you should be rewarded for doing it properly.
Honestly, I think the objectively best style would be a combination of the 7 style and the froyo/epsi style, but the reason I try to promote playing aggressively so much is because it benefits the game in many ways:
1. It's more fun to play
2. It's more fun to watch
3. It rewards team play and coordination better than passive play
4. Aggressive play is really neglected in tf2 and I believe it will address underdeveloped skills in the majority of the playerbase
To name a few, and until we fix a lot more glaring issues with how the game is played I think it's silly to blame everything on the gamemode even if there are issues with it (which I'm not denying).
I could be wrong, I'm just trying to speak my mind and act on what I perceive to be true, I agree wholeheartedly with gubbins' thoughts from that clip and if you disagree please don't hold your tongue.