I can't possibly agree more but it seems like a cottage industry on this board, and by extension writers, to want to come up with in universe explanations and justifications about EVERYTHING. And people wonder why trekkers get the geek rep that they do.
There's always an explanation posited. The real issue might be more about a balance, or in this case a lack of it. 90s Trek's delving into "Treknobabble", especially in VOY, even turned off "geeks". Maybe most dramas and shows don't to that extent, but there are always explanations. Also, wasn't JR's shooting nothing more than a dream sequence? Dang geeks on that nerd show...

(Seems more an issue of pedantry than "geekery"?)
I believe the mutation occurred when Rick Berman didn't want makeup appliances glued to Terry Farrell's pretty face.
To my current understanding, didn't Terry Farrell have an allergic reaction to the latex prosthetics, so went a different route with the make-up? Recasting and finding someone who has screen chemistry with the other actors isn't exactly easy, especially with time constraints?
Going back to the aforementioned nerdantry, could they really have explained it in-universe? Not when they didn't for the Vulcans and Romulans, and already passed off Klingons with the "outsiders" line in DS9. The species introduced in "The Game" (Katarians?) became a regular species in VOY but they changed the latex mold with zero explanation for that as well... (I recall Memory Alpha struggling to explain it, via sexual dimorphism as I recall... vaguely...)
Wasn't it ENT that opted for the "augment virus" thing, because - as explanations go - that one wasn't the strongest. There's a better one, devised fairly recently, that had the guts to try to make the transformation process a bit more authentic than the throwaways like that (and what "The Enterprise Incident" did to show Kirk looking like a Romulan, as if their ship's sensors wouldn't be used to point out non-Romulan intruders very quickly...
Enterprise had such sensors, which were used in the episode. Romulans didn't? )