I'm actually really, really glad durability is gone. It was almost never a real concern except for stuff that had like one use, or the S-rank weapons in FE6 - and that's just because they give you some of them so early and you miss out on the true ending if you break them. 'Match that power for a price?' the games usually just hand you a brave weapon around the midpoint, and it's very rare that you need to rely on it so much that it breaks anytime before the very last map.
Removing durability and making weapons more unique is a change for the better.