It’s beyond frustrating that, for what would be a simple function in basically any other web app, I need to jump through hoops and INDIVIDUALLY transfer ownership of every Doc I’ve made just so I can have my account associated with a different email. Not to mention I have to set up a new profile on this community board if I wish to continue using it. What a UX nightmare 
At the very least I’m at an early stage in using this otherwise fantastic app and the tedium of transfer is at least manageable (if interrupting what was a good productive morning block of work).
If it helps anyone on the Coda sales team to know: I’m dealing with all this now because I’m looking to upgrade from Free to Pro, but wanted to use my business email. I can see this as being a needless offboarding point for at least some users.