@Stanley Orchard You are absolutely correct. No one told me to do it but I like to see what YT search results show. It is very insightful to see what type of thumbnails are out there. I am no graphic artist or designer and rely on Canva. But I can tell you I love to see "competitive" videos that have no meaningful thumbnails, just a random screen shot or those that are loaded up with tiny text! When I see these low-effort thumbnails, I see OPPORTUNITY to get myself a few views!
Anecdotally, I can support your assertions that I get some outsized numbers of views by some of my "off the path" videos. Even as we go into 2022, there are still so many opportunities to win over views by just paying attention to thumbnail work. Lots of older videos where the owners have not freshened up their own entries.