socola
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The fundamental difference is that the mirror should be mirrored, and the other templates should not. Therefore, the fact that there is some degree of non-mirroring on the mirror is not the norm, but a reason to think about how to fix it. The "who gets the hero" roulette doesn't fit well with the idea of the mirror. Partly because it spoils good games by making players agree to a draw, not wanting to gamble (and I understand them).
In the future, I hope this loophole will be closed (at least on the mirrors), and for now, we'll close it with a verbal rule.
The fact that the "fire and buy for 100K" tactic disappears is not a big loss; it is used well in 1 out of 500 games. Finales with pawn exchanges happen much more often, so they are a priority.