I did notice a change in player skill / performance since Stormblood. See a lot less Dragoons not using Heavy Thrust, Monks keep their stacks up, Sumonners use Aetherflow ... What I do see a lot of still is people not doing their positionals in low level content. I don't know if they don't do it out of boredom or because they are not aware. Having done almost 1200 mentor roulettes, I must say that in almost all cases, the party is actually quite decent. I think this doom and gloom of bad DF people is overrated. In Extreme content, on the other hand, well I've seen some terrible stuff there, very irresponsible players.
Personally, I just expect all players to be fully activate and dedicated and not stand there auto attacking half of the dungeon. Do the basics right, DPS a bit as a healer, dictate a nice pace as the tank and I'm golden.