It's frustrating to have to use a new email address for every Optimizely account you get added to. Ideally I would like to use my own work email address across every account. So when I log in with that email I see a list of the accounts I've been added to in a splash screen and can then dive into each of these accounts. Google Analytics has a similar screen on log in.
There are likely to be a number of use cases for been a user on multiple accounts:
- agency with multiple clients each with unique account
- multinational with different accounts/business units per market but centralised testing team
- strategy or development freelancer who does ad-hoc consulting on different accounts