Fortunately, I have never needed to mine with NiceHash, and I don't think I'll start now 
I would hazard a guess, that older - frequent users of btalk are of the more advanced kind of miners.
740,000 registered users on the service (at least according to their claims) seems a ludicrous amount of people tbh.
Actually, it's much easier to mine now than when I started. Back in 2014 they're weren't many YouTube videos, tutorials on mining or dedicated mining OS's. Pools used to go down more frequently too. NiceHash is just for those that want plug-n-play mining and don't want to take the time to learn.
Agreed,
the rate at which the amount of information is multiplying (at least since 2016 when I started) about mining is massive.