To me this signals that XP gain has been made too important in the mix of reasons to play and reasons to keep playing. It's a design flaw in my mind, and while I understand why they did it, it wasn't the best way to go. To this end I try to slow and de-value XP gain in my games in order to take the emphasis off of it; there is still progression, but I want it to be way down the list as far as how prominent it figures in the presented reasons for play. Also a graph of it would look like it tapering off around the 400 XP point depending on the campaign. If a player chooses to fixate on XP gain/builds then fine, but the controls I have in place will mitigate that to a large degree.
How many full specs do people want for the character? It's not like you picture the main characters in the movies doing absolutely everything as a pro (except Rey). At some point the character reaches a skill zenith and I would hope it's about the story of the character from then on with some small increments of improvement. If you do it RAW you'll end up with Han Solo who is also a full medical Doctor and a Force Wizard with half a tree of Ace from AoR. No thanks.