Kav
congratulations,your explanation is very clear.
I'm sure that most of expert players know very well that the first ennemy is the variance from average and the extreme fluctuations.
The house advantage is not a problem:we can discuss if it's safer to fight against 1,35% instead of 2,70%,but it's beatable.
I'm afraid you forgot to mention the second ennemy of a player:the bankroll or the huge difference between Casino money and Player money.
I think you know the Bernoulli formula concerning Casino and Player bankrolls.
No hope for the player,even with a roulette without Zero!
If two players decide to play head or tail,the first one with 100 € bankroll and the second one with 10000 € bankroll,10 € per bet,there is no hope for the first:sure loss!
It's only a matter of time.