Most people don't tend to have to have their heart regrown by an Omega-Class mutant. And the situation isn't one that is likely to be repeatable, seeing as that mutant isn't here.

[Mysteries keep life interesting.]

No clue what caused it, but given timing, it's either the process that got us here, or a deliberate choice by what brought us. And I've lost a good deal of my practical knowledge. Can still tell you how Emma Frost and Scott Summers like to kiss, but I've lost a ton of other things.