Neat trick. Some websites don't even bother giving you any choice for traditional username/password input though.

It's just a further example of the software / online experience being so...fluctuating as a whole. Which has its pros and cons. Pros being freedom of visual and interactive expression. Cons being lack of expectation.

My router doesn't accept a username at all, which actually makes a bit of sense since there's only one 'account' on it. Unfortunately, this means that neither the browser nor LastPass will save the password. My previous router allowed me to change both the username and the password, then pre-populated the username field with whatever I'd entered (but didn't disable the field), which I always thought was odd...

In that case, I just click the icon for my pw manager (1Password in this case), and the modal shows me the same message.

Some places require no additional info from you.

There are good use cases where third party logins are good enough.

I do something similar with a generic password manager.

I've tried pinging the developers to support the idea directly, but I've been met with incomprehension.

Not sure if I'm explaining it wrong, or if it's way more work than I'm anticipating.

Try linking them to this thread? I feel like it sums everything up in a way that a dev would understand.