Don’t see why you would need to wait until almost-t3 stage for chrono when you can get it on like 1 or 2 less t2 pgens than something like uef shield which is a late t2/early t3 upgrade.
Well maybe you need to try it out in the context of the game and send us a replay
I'm just stating my experience : you have factories to feed in your game and not only your ACU, unless you play wonder 8v8 .. So you can't just rush 2 t2 pgens straight when you get t2 , you need mexes, support factories .. etc. If you gamble that your chrono will be enough to control the entire ennemy army, you can pause your production and your eco scaling to get it quicker, but it's such a danger.
If the opponent has a mirror eco (2 t2 pgens and some t2 mexes), well he's theorically in good shape to click the t3 upgrade while you're busy upgrading chrono. I would agree that the meta is to add more t2 support factories and not rush t3, so in a sense chrono counters the meta, but it's up to the players to changes their playstyle if it's hard countered every game (which doesn't happen, cause aoen is so rare ...).