Yeah number one is a big deal - you click a button, wait 5 minutes and are in action 5v5 etc. With balanced teams and know you will win around half the time in the long run no matter what skill level you at.
The systems are getting more and more sophisticated, faster and better at making people have incentive to play by manipulating their winrate in modern games. It's just the way it is and because of 5. Is hard to mimic e.g. manually by leaders of hostile factions cooperating a balancing sides with skill difference taken into account.
Some good points brought up there with 2-4,6 too, many are what I see mentioned by guys in my factions that don't log as much. 6. Being an issue always