Make daily crystal cooldown 22 or 23 hours
A lot of us play daily but between work and other life activities aren't always on the exact hour(s) each day. The current setup of the daily crystal pretty much means eventually you will miss one since each day it usually slowly resets later and later. If a cooldown of 22 or 23 hours was used it would allow the player some flexibility and only an extremely hardcore person would be able to sneak in an extra crystal every 11 or 23 days.