I do feel like sometimes players have a sort of laid back, "we should just win without too much trouble" attitude. Sometimes this manifests as "we take a long rest after every fight". And that's a fine way to play, so long as everyone's on board.

It can be kind of bad when half the group is kick-in-the-door-lol and the DM is expecting more tactical depth.

I think because D&D is many people's first RPG, you'll find a lot of bad habits there as new players rediscover them.