As for one-side-before-the-other, that's common in certain tactical shooters like XCOM 2, but again, XCOM 2 doesn't use initiative at all and all the assumptions are different - it's a round-based system, not a turn-based (no matter what it says on the tin). Really, your comparisons make no sense in context.
except that is still turn based. allies turn and enemies turn is still a turn. A round is after all turns are finished. thats why it is called a round. because it cycles through every available turn.
