What if we made lethality adaptive

This is probably a bad idea, but with new runes coming out and adaptive scaling being created, what if lethality was changed to being adaptive so that ap assassins (kat and leblanc mostly) could have it as a variable build path. I get that we have less magic pen than armor pen for a reason, but with some balance shenanigans maybe it could work. Right now ap assassins build extremely similarly to regular burst mages with the exception of gunblade. This could move towards creating a higher diversity of itemization between ap and ad.

I dont know what the numbers would be but imagine if edge of night gave 55 ad or 60 ap adaptive, or if ghostblade gave similar numbers, ap assassins would love it, but also they would focus on penetration as their more core stat and have less raw damage output.

I haven't thought it through fully so I'm sure it's a terrible idea but it could open new paths for current and future ap assassins, which we don't have a lot of.

Side note: they would to change how lethality works, it would have to be adaptive based on which damage type the user does.