This article is 100% opinion with no solid facts or case studies with UX tests.
I think the point you were trying to make was you didn’t like the FAB on one or two screens (Google photos) because it was implemented badly — this does not mean that the FAB is “Bad UX” it means the user experience designer didn’t personally take you into account when designing it.
I would be interested to see how many millions of people exercise the FAB button on Google Photos vs how many don’t and what implications this has on the overall UX of the product. But again this would then just be focusing on a particular implementation of the FAB and not the FAB in general UX sense.
Apologies if this comes across highly confrontational, I don’t usually comment on Medium posts. However I’d like to suggest to reconsider the title for this blog to: “My opinion on why the FAB doesn’t work on Google photos…” I sincerely hope this feedback is taken as constructive criticism.