It's not stupid, you don't understand what I tried to explain to you in my previous post. Zergs NATURAL tech path automatically counters anything that a Terran player might go for that strays away from standard play, BigFan is right zergs aren't limited by structures like toss and terran but not being limited to making 1 unit at a time is only a part of the equation.
If you play a TvP and you go dual starport with tech labs and produce banshees and marines theres still a good chance that you wont lose even if your push fails. However, if you try something with even the slightest risk (or even less riskier standard play) in TvZ, such as a banshee push, and it fails on the first push you can kiss your ass and the game goodbye because its just too hard to come back against a droning zerg that can handle your pushes. I never said that TvZ was IMBA either, in my opinion its pretty balanced. Terran just has to stay aggressive and harass/keep the zerg on his toes.
I also don't get how a failed TvP banshee raven push can still keep you in the game, but a failed banshee push(by the way who goes for a banshee push in TvZ? banshee drone/queen kiting but not banshee push) TvZ the game is over? This is so wrong I won't comment further.