@YouTube - how about an "I've watched this already" button? Maybe it doesn't increase the view count or anything.. but just to remind the algorithm and remove it from the recommendations. Sometimes the red watch time bar on the thumbnail isn't always accurate or informed.
I don't necessarily want to change the recommendation - just that I've seen that particular video already: I often see the same video I've recently watched (maybe on a different account) suggested from a channel I enjoy. I suppose I'll send my suggestion to that form. Thanks.