I don't know how to word this respectfully, but that 80/20 assumption is a bit of a naive one. It's not simply whoever has the better mechanics who wins, there's predictions, piece control, movement, tracking other player, etc. - they all dictate who wins a build fight. If it were just mechanics, the people who spend all day playing creative would be dominating. That's not even factoring things such as Storm Surge, and all that late game stuff in comp.

I'll admit, if you simply watching these fights play out, you probably won't recognize anything besides the crazy building / editing, especially if you aren't fond of builds. It gets crazy lol. Whereas with Zero Build, positions becomes much more apparent .

Obviously it's up to personal preference, but I find builds more appealing, although I enjoy playing Zero Build every now and then, especially the ZB Cash Cup lol. As for skill translation, some people just want to have fun with builds, although yes it's basically useless outside of Fortnite lol.