No, I mean - It's a good idea, sure. But I think none will use it if it's fully upped. After all, ai3 is what you grind to turn into a upped deck.
FALSE.
Ai3 is arguably the best place to farm for score. With a really good deck (speed rainbow, life rush), you can win in well under a minute, and gain much more score over time than any other AI. you can lose to top 50, and losing score offsets your gain by a fair amount. AI5 and FGs take too long and you lose against FGs too often to make it really profitable (even with EMs every game -- I tried).
But you don't need a fully upped deck to farm ai3, correct?
And when people start farming, they start farming from ai3 and most likely will get their first upped card and maybe even a half upped deck from ai3, correct?
Obviously, ai3 is one of the best ai's to farm - if not the best - but you don't need to make a fully upped deck to that.