The only impediment is the fact that it just isn't possible.

This has been a topic for years and the same conclusion is always reached. MMOs are among the most difficult to put out and keep fresh. Everyone has a different idea of what they'd want in a game, but nobody actually knows what they want. Technical and financial barriers on both sides are always a problem. Perfection is a pipe dream, but the real winners out there work on making things less of a slog than they used to be.

XIV has one of the better (best?) update schedules I've ever seen and the philosophy of encouraging breaks seems to work well enough. They also keep even the oldest content fresh and easy to fill.