Use the "passwords" feature to check if one of yours is compromised. If it shows up, never ever reuse those credentials. They'll be baked into thousands of botnets etc. and be forevermore part of automated break-in attempts until one randomly succeeds.
Yes, it is better. The likelihood that someone will physically access your device is incredibly low, the likelihood that one of the services in your bucket gets leaked and jeopardizes your other accounts is way higher.
I set mine to require my password after a period of time on certain devices (the ones I'm likely to lose), and all of them require it when restarting the browser.
True, but it's also highly unlikely that LE will steal your passwords.
My phone requires a PIN after X hours or after a few failed fingerprint attempts, and it's easy to fail without being sus. In my country, I cannot be forced to reveal a PIN. If I travel to a sketchy country or something, i switch it to a password unlock.