> I think it will likely result in lazy UX that's "good enough" for multiple device types.

This is already the case: the Marzipan apps shipping with Mojave are _shockingly_ bad (Home, News, Voice Memos). Standard keyboard shortcuts don’t work, drag-and-drop is inconsistent, and it’s clear that they never considered standard Mac features like multiple windows while designing them.

I worry that people will look at these badly-ported, out-of-place apps and say “Apple are doing it, so why can’t we?” rather than “Even Apple could only come up with this, so let’s not.”