I feel your frustration. It happens to me often that even though I ask it to remember me, it keeps logging me out. I know for myself though that being in an agency, I have access to different portals, sometimes with different email addresses. I guess that's the reason for it to log me out on a regular basis. Do you have access to multiple portals?
As to the option to not log specific emails, that's still available within the Hubspot portal. Here's the Knowledge Base article explaining how to do it.