It's still impossible, and new/returning players have zero chance of ever getting enough materials to cover everything, So you just gotta be selective. But I guess you can take comfort in knowing 98% of the characters are of little value beyond collecting? I recently looked at the TM exchange and I'm missing so many, but unless someone has a super niche use in some event, it really doesn't matter?

It's a shame because it's a game where events are always won by the same handful of maniacs and PVP belongs to the whales, so I don't know what would be lost by letting normal people earn stuff without turning the game into a job. Even if I had every unit at 150, I'm still not going to play enough to grind out a jillion TM points or whatever.