The main problem is they larded the app with so much obscure functionality and confusing user interactions. Then, when the UI couldn’t sustain all the new edge cases, they decided they would re-design the whole thing (badly).

Result: confusing UI, reduced functionality, and inevitable screamingly bad press.

They really need opinionated product management, with a clear vision, and decisions backed by hard data. Also, single-threaded ownership.

FFS, just make it do the basics with as few taps as possible. How hard is that?