The current icons really aren't that good. Looking at apple specifically: The facetime and messages icons are almost completely indistinguishable. Get angry and say I'm blind, but so is a lot of the userbase - like legitimately, legally blind people.
The camera icon on iOS is just a fucking camera lens with a grey background. No context.
Sure, but it's not clear they're unrelated. Maybe interesting is necessary (but not sufficient) for usability?
Also, the newer icons don't really indicate a word processing application. If anything, they're look like they might be for a drawing program. So regardless of interesting/abstract/whatever, it seems like a poor icon choice.
Usable icons _are_ a bit interesting. A bunch of same shapes with same-ish colors on a grid is NOT prioritizing usablity. It's prioritizing minimalism. The middle icons in that list are interesting enough that your visual cortex can pattern-match to your previous experience selecting that app without much conscious effort. The oldest is a bit much but at least still recognizable (not necessarily "well known", that's different), but the new ones are worse: so boring and generic that it takes actual conscious effort to select them from a sea of sameness.
