I really like it when apps have a "search" button conveniently located at the bottom of the screen where I can get to it while using my phone with one hand. But then they go and put the text box at the top of the screen, and once you realise you now have to go and click that, you have to change how you're holding the phone to click it to then actually start searching - using the keyboard that appears at the bottom of the screen...
I know this is the definition of a first-world problem but it's amazing how many apps do this. They've taken something that should be one easy swift click-and-go, and made it into two awkward movements to opposite ends of the screen that completely breaks flow and concentration. Ew.
I imagine this would be even more vexing for people with accessibility requirements...