I'm level 30 and play the one class. I have multiple pieces of gear fully maxed so whenever I switch I'm still level 30. I have exotics like Gjallarhorn, Thorn, Suros Regime, Hard Light, Invective etc. And a bunch of handcannons fully maxed out along with a Shadow Price and two fusion rifles. Really all I need now is a Hawk moon and an arc fusion rifle. Also I have Timebreaker and Vex mythoclast. Am I bored? Nope. Cause even though I'm basically done I now have the chance to really start helping people with the raid or nightfall or any bounties. I really have no interest in making another class. And also it gives me time to explore. You wouldn't believe the cracks and crevasses in these areas that have hidden pathways.