Resource management is something that only wizards have to worry about, and not even they really have to worry about it that much after 5E, especially given the abundance of party supplies.
Rly? O_o
How so?
In my Experience, Paladins, Clerics, and Sorcerers spellslots were lost fastest ... and Warlocks obviously, but they also get the back pretty fast.

It may have something to do with fact that Wizards, unlike the others mentioned, can renew some spellslots outside of combat.