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You are talking about a revolution that occurred before these people were into shooting, or they were not into filmmaking at the time, thus they don't understand what you are talking about, "people shoot video on mirrorless".
When I say revolution I truly mean it. It was an absolute shock to the video/filmmaking world when people suddenly found they had access to a large sensor camera capable of recording video. You have to understand that up to that point in 2009, the only way you could capture video on a large 35mm size format, you had to rent a Red or an Alexa, (200K systems) or shoot even more expensive super 35 negative film like hollywood directors.
Lo and behold, in 2009, Canon suddenly, i n a firmware update nonetheless, which is hilarious, added video capture to the 5D mark II. The camera was already "shooting" video to give the Live View feature on the backscreen, so they just said hey, why don't we dump it to the card and give people video recording?
They didn't realize the implications of what they'd allowed, the ability of low and no budget filmmaker to shoot on a format that's even larger than hollywood 35mm film.
I remember back then, Canon hadn't realized what they made to the point that they didn't allow users to manually change exposure settings in video mode and it was always on Auto with no way to lock it. They also didn't give any other options aside from 30p. And they had no audio meters or control, so we asked Canon for it all and they delivered with a firmware update, enabling manual mode, audio control, even true 24p!
Year after that, and they delivered the t2i/550D, a camera with a sensor the same size as 35mm motion picture film pr Reds/Alexas, with full manual control, 24p, audio in, all for a cool 500$. This was the real democratization move that gave us all ability to shoot nice, actual looking films.
That's why DSLRs mattered for film.
