I think hero level should be as requirement. Ignore this in private games or when you are hosting. But for quickplay you should have proper level.
With level you get Talents, Power level, Proper gear.
Power level on its own means nothing, and when you play on secondary character you can join legendary even with power level 10. It simply unlocks once you reach legendary level on one char. You dont even need to equip “twinked” equipment.
My friends are quite regularly pulling me through legendary runs with my low level characters. So it is possible to beat that in 3 people. But you shouldnt be able to bet on this always, and straight out leeching high difficulties with low characters is bad .
Hosting - OK.
Private sessions - OK.
Quickplay search - Limit.
Legendary - Level 30.
It sounds ra… “levelist”? but it would be great QoL change. (+point for proper use of shortcut )