Destro is an example of a much bigger problem that is combat design and how it translates into fun -or lack of- for the great majority of the player base.
A walking tank with insta gib capabilities combat design is just bad -because it is not fun.
A non healer could keep most/all DPS specs up long enough to kill whatever its targeting …
Healing should be for healer’s … Damage for DPS and harassment/soaking for Tanks.
Ofc healer’s and tanks should be able to do damage and DPS should be able to keep self up to a point …
Today burst abilities do too much burst even healers drop like flies.
DPS heal and mitigate like tanks and tanks are ok(sh).