More chances to time a key with non-meta classes. Right now, it’s hard to find a group without upgrading your keys. Leveling up a key is more difficult for non-meta classes than for meta classes.
Less frustration from failing
Disadvantages:
The more you play, the more chances you have to time a key, potentially creating an impossible run that can’t be completed unless you have a million tries
No penalties if you fail a key by time; perhaps we need to redesign this aspect
I haven’t thought about every possibility, but I feel like people would be less frustrated in PUGs