The problem is that without "infinite content" there WILL be time when u will get maxed out. By "infinite content" i mean different kinds of player competition other than being "first", like pvp (fortunately on 2.1) or content with scoreboards like fastest clear, longest survival, most enemies defeated.

Even if are not maxed on all jobs, the week mostly ends after doing all coil turns that u can and caping myths. With full dl there is no point in more grinding.
Levelling another class might be fun, but constant fate grinding gets tedious fast. Levelling by running "one instance a day" looks somehow fun, but really viable only as tank or healer.

There is something worse. When u get new class to max lvl, u would want to start grinding gear for it. But if u dont already have great gear, almost no one will want to party with u! So that leaves gearing SECONDARY job with ur MAIN job. And this way u dont play that new job at all. So u can only farm with ur new job when it does not need it anymore!

That leaves crafting, gathering and money making, but poor profit without personal housing.