You guy know there are professional gamblers?
Gamblers rely on body language more than RNG as well as probability of certain cards popping up. Plus the amount someone bets is a good indicator of whether or not they have a good hand.
A professional gambler would demolish any backyard Poker match because of this, even if the cards "are chosen at random," but statistically speaking, they are not, to a certain extent.
You know that professional hearthstone and MTG are things, right?
Decks arent that all random, there are many cards that allow you to go against your luck of draw to get the cards you need to play faster. In some cases, multiple copies of this card are allowed resulting in a -X amount of cards in your deck.
Say your deck consists of 40 cards. 3 of which allow you to gather cards faster. Those 3 cards are really 6 cards (assuming they let you grab one at a time) and it lowers your deck to 34 cards instead, increasing your chances of getting the cards you need faster. Which these are only 3 of the same copy of cards, you can have multiple cards with similar effects.
There’s this cool thing about RNG, no matter how prevalent it is — you as a player can react to it.
This literally goes against the definition of RNG.
In all these other examples of RNG I’ve given, there’s always a handful of people at the top that STAY THERE
Bad examples, because they know how to work either against or with it.
Most gamblers winnings are won through making a series of low bets with bad cards and decent bets with good ones. If gamblers bet the whole pot each game they'd be out of a job.
If RNG was such a deciding factor in their chosen sport/profession/game
It's not, as I just laid out.
Because like it or not, even with RNG — there are good players and bad players.
Yes there are, but in the cases you laid out, randomness can be controlled in your favor or you can "read" people to help yourself out.