None.
The player who plays better will win 100% of the time.
Absolutely wrong. RnG can decide a game against you no matter how well you play.
Situations that come to mind are like making a calculated decision to trade your heavy (tiger/is2) for your opponents because you have dominant map control and then your opponents heavy ends up being abandoned.
A situation i had vs a player in this thread. Lost three of my medium tanks only to abandon the same panther twice and precede to lose the game because of this.
RnG can and will never hesitate to fck you in the ass.
Removing abandon will be a solid step against how wildly ot can affect you.