Are you sure? When I used to watch Battlebots on Discovery channel it was basically 6 minutes of action wrapped in 10 minutes of fluff and 15 minutes of ads. Discovery Magazine had 3 sections per half-hour; comparatively speaking any science channel in YT will have
way more content, and a lot of it really good for specialized audiences. Travel YT are way more up-to-date and useful than TV travel documentaries used to be.
There's a ton of really good Youtube channels, and the level of information density is astounding.