Having access to the full kit while synced down would require immense amount of balancing work to ensure you do not have an advantage over a player who really is at the given level. Removing the skills eliminates this problem entirely.

But this thread is feeling like a waste of time, OP is being aggressive and shows no regard for the fun of the actual newbies in dungeons with no intention of changing their mind. I'll hazard a guess that the OP is going to be the next person who will open a complaint thread about the unskippable cutscenes in two particular dungeons, if they make it that far that is.