The skill progression is atrocious

[DPZ2]

And I really doubt, that the dev team has to sacrafice a dungeon/raid/whatever just to let us learn those few skills sooner.

If that was what was being asked, you'd be 100% correct. However, what was being asked was to either have your full kit (from level 80) to use in dungeon instances like Sastasha or at least have most of what you use at 80 handed to you on a plate leading up to level 50 (and then have access to it).