You'd think that people so obsessed with level cap would do some real research into how you get past level 20. It's a gear thing, not experience. In Destiny, the primary purpose of your level is really to determine how you scale toward enemies anyway. If you noticed in the Beta (and Alpha) you were able to continue learning new skills after you hit the cap. That's because for all intents and purposes level and skills are separate. I expect that when you get your second subclass your character level will remain the same and any new experience you get will just learn those abilities. People need to realize that the levelling in this game is different from an MMO or typical RPG. There is no "level cap", there is a maximum amount of levels you can gain from pure experience (which is 20) and the rest depends on gear stats.

The level cap IS 20 for Guardians. Enemies can be higher. From what I understand, you're able to gain further effectiveness with the Light stat (similar to Paragon in Diablo 3) to combat those higher level challenges.

Which video? I don't see a lvl 29 player in any of them. I might just be missing it.

no