In the previous version of the game this was not as necessary just because we found a ton of RARE and EPIC heroes to perform and shine but as it stands now we gain massive amount of legendary heroes ( it's a good thing , thank you ) which benefit a lot from inspirations from various points of the affinity tree making even "good" EPIC/RARE heroes unusable ( only specific ones that have a niche utility skill or Beags are used just to empower the legendary heroes ).
The biggest loss in my opinion is team building now because it has eliminated any thought and has become " insert legendary hero with the x dmg school " , EPIC heroes don't stand a chance anymore (especially DPS) , like i said some supports are fine because of utility but you will never see an EPIC DPS Hero ever again, even if we can inspire them to i5 i think they won't be super strong but at least some heroes might find a spot and usage over an i0 dps heroes in some places , heck maybe we could even see some i5 EPICS be used in PVP now they are just worthless paper that get blown up.