I've done similarly, RedLetterMedia, some of my fav streamers and long plays, Gaki no Tsukai - and recently DnD streams. If I'm on my PC at least, I play the videos straight from youtube as a means of support to the channels, but any other time? I've got my copies on a loop.
Had been using Tartube and I never delved deep into youtube-dl cmd prompts. Recently it seems to have issue downloading the highest available quality, but I'm beginning to not care as much most of the time, I just rip it to a lo bit rate mp3 to listen to when I'm driving, cooking, w/e. Most of the time, the content I have is very conducive to just audio only.
Have you any copy pasta to drop? Most GUI attached to yt-dlp seem to run into hiccups from time to time. My most recent case is it downloading 720p rather than the highest available video.
I think I managed in the past to figure out how to run prompts at some point, but it was a confusing affair for me personally. I like how most GUI allow me to copy a playlist and kinda just forget and let it download.