Why would I want the headache of securely storing credentials if I'm running a web app? I'd rather offload it onto Google. And yeah, it's probably more secure.

Why would I want the headache of having yet another login/password to remember, if (like most people) I haven't figured out password managers? I'd rather just use my Google identity, especially if I don't really care about this particular web app.

Normal people just reuse a few variations of the same password across all of their accounts. Federated identity isn't bulletproof but it beats the heck out of reusing the same password.

Do you remember when people had to "remember" a password for every service they use? It is better to use a trusted third party. Sure these third parties are big corporations, but its safer for most people to have a login that just works, even at the cost of some privacy.

People trying to remember passwords is a pretty bad security situation.

I'm not an expert but so often folks on here throw criticisms without giving credit to some of the merits of solutions. Nothing is perfect, and progress can still be made. :)

It probably is more secure, to be honest. I trust Google to keep my account secure more than I trust some random website to store password hashes and verify securely.