With this statement I suppose you either
- do not really need the core features to work correctly for your way of flying, or
- do not know what the core features are in a sim.
Either way, the important thing is that you think it works fine for you 
I mean, this sim allows for all kinds of use so I can imagine that someone who spawns on the runway with engines running, firewalls the throttle(s), flies mainly from the outside view and just enjoys the visuals is probably not much concerned about all the bugs (core or aircraft related) reported by the community.
And that is fine.
Then there are all the others who also care about avionics, systems, performance, procedures, navigation etc. who probably would not use core sim and OK in one sentence.
