Want to switch which user account you're using? No problem, simply find the picture of the current user account that you definitely don't want to use, and click on it.
Clicking your user account picture to access actions related to your user account (such as, change account, logout, change this picture etc) actually seems pretty intuitive. Where would you expect to find this functionality instead?
I was expecting to find it there, but older people who I've walked through these interfaces would expect it to be under something like "settings" or "switch account" rather than "this account".
Also, it's really a stretch to say that an action related to account x is "switch to account y."
Want to switch which user account you're using? No problem, simply find the picture of the current user account that you definitely don't want to use, and click on it.