> STOP CHANGING THINGS! Even if the new UI is better (debatable), some people just like or rely on a particular layout to operate the device or app. Don't rearrange without giving a ~permanent setting to use the old layout.

The fact that we're 15 years into smartphones being popular and that phones & computerized address books were basically fully-solved interfaces long before those took off, and they're still fucking around with phone app UI in big ways, is a sign of some kind of institutional or industry-market failure to me. Or both. Allowed, I suppose, because Google's market position (i.e. monopoly across several markets) both gives them the surplus profit (i.e. rents) to fuck around and waste money on harmful to users crap like phone app redesigns, and insulates them from any actual threat to their profit due to those bad choices.