Yep, downloading copies of videos so I can watch them on long flights is one of my main use cases for yt-dlp.

I suppose someone more sycophantic to the wishes of trillion-dollar corporations could argue that I'm not entitled to do this for free, and that YouTube offers an offline download option as part of its $13.99/mo Premium offering. To them, I'd say "you're right, also go pound sand lol."