I feel like one of the reasons is that it is a lot harder to fake a shaky video than a still one and he won't need to add in his voiceover in comparing to if he is directly recording from the digital microscope presumably.
If you want your work to mean something, make sure the focus of attention is totally convincing.
Or soothe yourself in knowing all that work is destined to be an unconvincing footnote appreciated, at best, in hindsight