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?
Use isolated browser instances instead. I want to be able to install useful addons for YouTube without having to worry if they’re monitoring me when I’m online banking etc. All modern browsers offer this. And I use a mix of browsers for different tasks. Like Firefox for most things because of the ad blocking / privacy. But I still use chrome for compatibility as some websites are lazy.