Is there such thing as too much Crit?

Im a DNC main if not obvious already, tonight was melding and got too wondering, Is there a point where stacking Crit is no longer viable?

Im at 1866 with all but one jewelry part filled with CritX materia (The one is a DHX due to not allowing for further crit)

So yeah, is there a point where crit isnt viable anymore for stacking? (If that is even achievable atm)

I believe there is, but that would be if you could reach 100% crit with stats alone.

Crit stat increase both crit rate and crit damage.
You never loose on the stat.

Picture a frequent lottery, the more ticket are purchased, the higher the reward.
If you invest a lot in these lotteries, you will get a frequent, bigger reward.