I have said before in previous posts (sadly which did not get traction), that a great way to fix this would be to have:

1. a practice feature where after beating a phase and dying you start over from that phase. Of course nothing is dropped from this other than a title when you beat it. However, this would give practice groups a place to actually practice end phases without spending hours of time getting there.

2. Consider having a save feature in the regular fights in an increasing way. If you beat phase 1 10 times in a row, you start at phase 2... etc.

Lots of people liked the idea, it just didnt stick around because there wasnt enough arguing to keep it afloat :/