>Arguably, you'd still have better productivity had you not have to sign-in.
No, that is not arguable for anyone who takes more than a few seconds to think about it. Signing in has nothing to do with authentication, it's about things like "I want to have my own preferences set for showdead/noprocrast/etc. I want to maintain my own lists of favorites." Authentication & security are about making sure others don't access/alter your account or use your property or the like without permission, not about there being infinite resources and everyone being perfectly identical.
No, that is not arguable for anyone who takes more than a few seconds to think about it. Signing in has nothing to do with authentication, it's about things like "I want to have my own preferences set for showdead/noprocrast/etc. I want to maintain my own lists of favorites." Authentication & security are about making sure others don't access/alter your account or use your property or the like without permission, not about there being infinite resources and everyone being perfectly identical.
>So you are still making a trade-off
Nope.