Yeah this was also my reasoning, that's why I got a second hand OnePlus 9 Pro and installed LineageOS on it. Well actually iodé, which is a privacy oriented fork of LineageOS with MicroG and a firewall installed. It works flawlessly, I'm very satisfied with it.

The OnePlus One was my favorite phone to hold ever, but it was sadly let down in software reliability due to the the melt down in the relationship with Cyanogen.