> But a year and a bit later, the software is already starting to slow down even with a reset (switching to video from photo incurs a good 5-10 second delay, opening the camera itself takes a few seconds)

FWIW that's really not normal. Sounds like I got my pixel 3a around the same time as you, and I haven't had any problems like that. I wonder if you have a hardware defect of some sort.

> Coupled with Google's terrible implementation of work accounts

What's special about work accounts? I added both my personal and work Google accounts without any issues and can see events from both in my calendar, switch between them in google drive, etc.