That's actually an important distinction. You can recapture the DRM protected (and then decoded) video pretty much always indeed, but then you degrade the quality by having to encode it again.
Well, not important to some, but for enthusiasts and people looking to actually archive things, it is very important.
Case in point, hilariously, the last time I used YouTube's video download feature bundled with their Premium offering, I got a way worse quality output than with yt-dlp, which actually ripped the original stream without reencoding it.
I think I saw an idempotent h264 encoder at some point, where you wouldn't suffer generational loss if you matched the encoder settings exactly from run to run. But then you might need the people mastering the content (in this case YouTube) to adopt that same encoder, which they're not going to be "interested" in.