I get they want to work against ad blockers, but as a Premium member I really wish there was an easy way to watch a video without it polluting my history or recommendations. I don't want to watch ads just due to that.
I would love something like what Spotify has - private listening. In the meantime, I just go into the YouTube history and remove anything that I don't want to pollute my recommendations. Turning off search history entirely also is good.