We definitely don't need more "dark pattern" implementations to artificially keep users logged in when they don't want to be. It's annoying to have to scroll around a website hunting for the logout button.
Several years ago I had a Discover card account, and one of the things that I always particularly liked about their website design is that when I wanted to log out, the button was always highlighted right where I first looked at the top of the page. The result is that I didn't leave their site every time with a negative thought about how long it took to find the damn button. I wish more sites took that approach.
I've lost count of how many times I accidentally logged out on mobile because not everyone has good dexterity when using a phone and can't so readily click on the profile link without fat-fingering 'logout'.
Never had that happen either
<shrug/>