I download when I have free time to fill / kill. I watch one genre of videos and periodically check on a number of channels that have that content. I watch each video working down the list deleting them as I consume them. In the rare case that I want to save something, I toss it in an unmanaged directory of internet content.

My Plex library is where managed content lives. Stuff from the internet doesn’t deserve that level of care (in my system of data management).