Damn. My skills are finally capped. We definitely got way more toys to play with than the Alpha. Thank you, based Bungie. All I wanted was more Warlock skills for the Beta and you guys delivered.
Wish they would straight up give you a message though. Something like "You can no longer gain XP toward your subclass in the beta."
I just turned in a bounty for 2500 XP and I looked at my subclass skill tree before and after.
Doesn't budge any more. And doing a story mission shows that now only my weapons are gaining XP. No more skills in the "Advancement" section post mission.
Here's a picture of my skill tree to the point where I'm not gaining any more XP:
I've been watching specifically the lower left most skill (3rd Grenade: Axion Bolt) for the past hour. Doesn't budge even a millimeter beyond that point any more. Again though, no complaints. They gave us like 5-6 more skills than in the Alpha.
Will finally be moving on to a new class.