Google logins are the absolute worst, now you have to remember which of your accounts you logged in with (like many others here I have 5 active accounts - I really wish they could give me a single identity that would work with all of them).
I have separate google identities because I have a gmail account and my work uses Google Apps; I also have another account that I use for YouTube which I refuse to merge into my gmail account (if that's even possible).
I don't want to merge them together because they're separate accounts for separate purposes, but that's a difficult position to keep because of how absurdly difficult it can be to deal with multiple google accounts. Even though Google supports multiple accounts, their base assumption is that people have exactly one Google account which is exactly one identity which incorporates all of one person.
I've been unable to accept calendar invites sent to my work account because Google Calendar insisted on opening to my personal account when I clicked the link; even if I opened my work calendar using the drop-down, and closed the other window, the link would only open to my personal calendar and then tell me 'you don't have access to this calendar'.
It feels as though the parent poster was asking for Google to understand that one person can have multiple accounts, rather than assuming a 1:1 mapping between the two and behaving as such.
I have one gmail account and 4 different google apps accounts (one so I can have a personalised email that I've had for 15 years, the other 3 are different companies that I'm involved with). I use trello with 3 of those accounts but i only want one login, hence the confusion...
