I already update my browser at least once a week when I update all of my homebrew packages; sometimes more. If a vulnerability shows up that's so dangerous I need to immediately patch, I'll hear about it on HN etc.

Of course it is good to keep your software up-to-date to eliminate known, patched vulnerabilities. But there are enough unknown vulnerabilities out there that you should practice good hygiene on the web anyway. Auto-updates typically happen on a 1-7 day time scale, so you're vulnerable for some time anyway.

I control when my software updates because it's running on my hardware. That I control. I do not like things auto-updating and restarting when I'm trying to use them. It is a distraction from work and a sign of software doing things against my will.