https://i.gyazo.com/b66c726f96bcd55d...e82d8d84b9.png
You can see Solace at the bottom, which means this is the SHB changes. Even in SHB, Aero2 was 18s, not 30s, and only became 30s duration when upgraded to Dia. The change that standardized the DOT at 30s the whole way through the levelling process did not occur until well beyond Endwalker's release (given that I can see the patch note for the change in the
6.1 patch notes). If you want to say 'A2's duration was changed to be
functionally 30s thanks to it's upgrade to Dia, A: say that, and B: it still didn't do that till SHB introduced Dia.
If you want to tell me I'm wrong/misremembering/blinded by nostalgia, that's fine, but you better come with receipts cos I sure as hell will be doublechecking this stuff.