This is definitely a feature I feel is sorely lacking!
I got an email about an unauthorized login on one of my accounts, and started tightening security on that account. After a second unauthorized login attempt on the same account within a short timeframe I started wondering if anything else is compromised as well, like for instance my Bitwarden Vault.
I find that unlikely, but even so it seems like I can’t actually find out if anyone has logged in to my Vault since there’s no login history. I would definitely feel an extra sense of security by being able to see a log of my various logins to the Vault.