I also have another reason why I feel like download and off-line-only video is important:
Privacy.
Streaming services have increasingly terrifying and inescapable telemetry. Spotify, Netflix, Amazon, Google - all of them collect extremely telling things about us due to when we pause video, for how long, which bits we rewind back to, when we consume the content during the time, where (GPS-wise), how often we play them, the collective profiling of us based on what we download in general...and many other things we don't even know about.
After listening to Shoshana Zuboff's audiobook 'The Age of Surveillance Capitalism' - the most important book I have ever read on technology - I am very aware of this. The data companies don't want us to be aware of what they're doing to us.
I'm not condoning piracy, and I believe content creators should be fairly compensated for their hard work - but unless there's a convenient way to be able to consume content in my own open-source local software such as MPV, all offline, and in full privacy without being spied on, I refuse to legitimise the alternative.
I realise there's still blu-ray and DVD, but not always - many releases are web only, now. I'd even pay a premium more for such non-DRM content...your move, Hollywood.
It was never natural to have people watch and profile us when we're already paying money to watch personal entertainment, on this massive global scale.