system
A chat on subreddit /r/me_irl
human
I'm at almost 5200 hrs, been playing for about 3.3 years, and there is still base classes I've yet to play, and quite a few acendencies I've yet to play, and quite a few playstyles I've yet to try, I still learn new crap daily about the game.

Anyone that says they are an expert at the game or knows it all is basically a liar, as even the no life streamers that make their living off the game don't know everything still, they know a lot more than 99% of the players, but each one will admit that they basically specialize in certain areas but will admit that there is still much more they still don't know, they will generally know the basics and even intermediate level knowledge on any given subject, but each has playstyles or archetypes they don't like playing and so they are a lot less informed on those areas even after 15-20k hours.
gpt
at 5k hours too, first time playing scion, the last base class I haven't touched.  Been making it a point to try a new base each league for the last couple years, was always witch or duelest before.