I tried a similar approach on https://www.moraleapp.com https://www.moraleapp.com with mixed results. It makes sense for a manager/boss to have an account, but

I tried a similar approach on https://www.moraleapp.com https://www.moraleapp.com with mixed results. It makes sense for a manager/boss to have an account, but I didn't want to have every team member sign up for yet another service. So each email sent out gets a randomly generated token that allows the recipient to "log in" (all responses are anonymous, each sent email has a token - not each email address). I think the idea is really great and helps with adoption within a team, but it has also led to some confusion because there is also a traditional Login page. My take-away is that it is probably better to go all-in on one approach (all email-based or regular logins) than a half measure. It is kind of interesting because it seems to cause trouble for users that are semi-technical; the ones that know how a username/login works in general, but are thrown for a loop with this whole "email is how you login to our special app!" thing. Super technical users understand and super newbies don't really seem to notice, but those middle ground users are a bit confused.