It does make logins on other machines difficult. You may open up your password manager's web interface on your friends laptop, but then you opened up all your passwords to potential malware,including banks etc. When you just wanted to log in to Reddit, where you have an account you somewhat care about: you spent years under that username, but its not a huge catastrophe if it's taken away, unlike, say, your domain registrations, your email password, your e-government logins, banks etc. The "all eggs in one basket" still bothers me.
We haven’t lived through a big password manager leak yet. But a password manager gives the list of usernames, passwords and websites. This kind of compromission is probably worth a million dollars per user. That’s a lot of data in the same vault. Just saying.
Mist people arent worth a million dollars, that downright silly.
But i do agree that centralised storage of everyone's passwords does not make sence.
I've decided to use KeePass and store the encrypted password file in cloud storage - that way it syncs between my phone and conouters, and i can always get at it if i really need to. But it does make logging into reddit on someone else's oc very difficult.