I am personally opposed to automatic login for any machine on a security basis. If it is stolen, all the thief needs to do is to power it on and gain full access. A login will at least slow them down.
I have one machine that automatically logs in on boot. It is a hub for a home automation system that needs to be running to execute the automations. It's on a UPS, but I have it set to reboot if the power goes out and then returns later and it logs in to resume the automation functions. It's out of sight and has no keyboard/monitor (That is called "headless.") so it's likely to be missed unless they know where to look for it. And it has nothing important on it other than the automation, which can only run inside my own home network. Nothing personal, no accounts, no other passwords, just the automation.
So, my recommendation is NOT to use auto login.