I think the RNG as a poker card deal is, ideally, (and mainly at most sites) programmed like this:
It simulates a human shuffling. Period. It is random, as in it virtually changes the order of the cards every hand. It will, IMHO, never match the randomness of human card game dealing. A random computer dealer will be like a drummer compared to a drum machine (maybe a bad example as the right programmer can do wonders but...), or a human compared to a robot. The RNG will reorder the cards. But, just like most computer drums, most robots, you say "yea, reall close, actually quite good but it is not EXACTLY the same".
Things like a sleepy dealer who unconsciously shuffles badly or whatever. The computer will not, yet anyway, simulate human coincidence or mistakes. It is perfectly random.
Which is actually fine.