In my experience most of the content I see people do is their daily roulettes, and often times it takes them a couple hours a day, which comprises about 50 to 80% of their daily playtime.

In these roulettes, many many times you get around lv50 synced content.
50/60/70/80 dungeon roulette is more often than not a lv50 dungeon
leveling roulette is most of the times, in my experience, a below lv50 or a lv 51-59 dungeon
trials roulette is thornmarch, a hard difficulty trial, or at best a lv60
main scenario is all lv50
alliance roulette is more often than not crystal tower, and when it's not, people just leave.

All in all most of my friends spend almost all of their combat time playing as a lv50 or 60 restricted job and never get to touch the abilities and actions at higher levels.

I have suggested them do something about it, be it queue as a full group using the level relevant option for leveling roulettes, but they just... don't do it.

And when it comes to having to actually do level cap content, such as aglaia or ultima's bane unreal, they are clueless as to what half their job's ability kit do.

not to mention, I see a lot of people complaining about others being unskilled, to which I wonder, is this a problem induced by the roulettes system?