That question came up to me, when recently working on one project I needed to restart my PC several times. And therefore, while I used 3-5 web apps I needed to log back in to each one of them again, after each restart. And I started wondering if privacy-wise that auto-clear feature is worth it or not? Has anyone maybe tested that?
I’ve taken to the habit of just logging in to the few sites I have accounts every time I open the browser. At this point, all my browsers are configured to delete all data. I don’t find it an inconvenience, and I feel it adds a layer of security. I don’t even use a password manager (though I should), as brain exercise I’ve memorized the few passwords I need. For me, it’s definitely worth the slight extra hassle. However, I accept this may be a bit much, given I’m pretty much the only person who uses this computer. I just feel more comfortable flushing all those pesky cookies daily.