Yes scourge is amazing but never picked as a healer on HL content because of this big lack of unique boon...
@Eekasqueak.7850, I think they missed something with this last specialisation . My point of view, they should have removed this kind of F2 and let the player pick archemorus or Viktor skills instead. Would have been the first spec having 10 skills to choose. On normal content you could optimize your survival if need and go full dps if you play with mates. F2 only remained as the endurance refill mechanic.
I think they should go as they did for a lot of professions ; one profession being able to fit the 5 roles [adding here exelling in cdps or pdps and tank] BUT never let a spec being able to do everything.
To go further, best would be something like this for pve only : all classes being able to be powerquick / condiquick + poweralac / condialac + quickheal / alacheal through his 4 specs.
Reminder it's PvE only. For WvW and PvP they should continue adapting as it's not meant to be played the same (we already have this skills effect cut between gamemods)