My beef with history as being a not-so intellectual subject is on several grounds. First, history doesn't really teach you how to think. Second, history doesn't really teach you much about the world -- how it operates and its inner machinations. Third, history doesn't teach you about nature or metaphysics. History in the driest sense is just a random collection of dates, events, people; until history is brought under a comprehensive philosophy of history it is a rather non-intellectual discipline and exercise. Knowing a lot about, say, the Thirty Years' War is nice and all, knowing the dates and individuals involved, outcomes, and so forth--but so what? Knowing the history of the Thirty Years' War is nothing when compared to a rigorous philosophy of history that understands that conflict as part epochal war and constitutional-juridical struggle. (I say this as someone with a B.A. in history, among other subject matter and who is a technical historian on account of academic publication and being cited.) Knowledge of history
becomes useful when subjugated to other more rigorous disciplines, such as comprehensive and systematic philosophy, economics, or evolutionary science.
I only have a very thin familiarity with MHV (having seen a few of his videos), I tend to avoid YT (apart from lectures or interviews with serious academics) as I find it a cesspool (for the most part) of dilettantes and thought-cheerleading, superficial as superficial can get for quick consumption in our increasingly digitized and consumeristic age. That's not to say, however, I'm a sort of neo-luddite; there are great uses and benefits of technology and the internet -- mostly for resourcing and archival purposes which allows one to have greater access to texts, data, resources, etc.; and also allows for access to international publications (online-access) that one would never really have had access to a century or even thirty years ago. Never, however, would I regard Wikipedia (which is deeply misleading and oftentimes flat out wrong), YT stars or channels, as the manifestation of serious thought; and such sites, even the better ones that exist, are no substitution for actual reading. As it relates to MHV, he has nice graphics and does offer citations which serve him well enough.
But, nothing beats
actual reading, and nothing beats cross or interdisciplinary study and engagement. (I say this not because I happened to be a student of both the social sciences and humanities with a strong lay interest in evolutionary science and biology as a reader of the journal
Nature.) Such is the way of the world as we become more consumeristic and expecting cheap and quick thrills; as this culture of cheap consumerism spreads so too does this have ramifications on how people digest "intellectual seriousness" which is hardly intellectual or serious.
My view on the matter is that the vast majority of internet sites is if one utilizes them as a starting point that's a good thing. But to regard such cheap consumption as serious is a problem. When he cites from a work you should probably track it down and read it. But I'm a paranoid anti-consumerist who is not without being guilty of his own hypocrisies!