The case of level 60 dungeons not needing healers is more a symptom of ilvl caps/more HP from accessories and general potency buffs of baseline actions over the years to be fair. There's the occasional job like WAR having access to the drastically different and empowered Raw Intuition at that level, but by and large it'd be closer to HW if they didn't let player's power run as unchecked by putting on tighter gear restriction, removing direct hit functionality until 61 and having one of those level 84/94 traits that increases all your basic action potencies for every job once per expansion level range.

It'd also help solve the problem of too trivial battle content for new players in perpetuity somewhat.