I watched that video and he has some valid concerns and solid praising. Having said that, he is both right and wrong. He's correct in that to get the very best out of this camera, you need to utilize an external monitor to unleash the 10-bit 422 Apple ProRes. Then again, he's a cinematographer and for that line of work, he NEEDS that 10-bit 422 color space for proper color grading. However, he's also wrong, as for the average user, vlogger, or youtube content creator; an 8-bit standard color profile straight out of body image is MORE than enough. Especially for those who need to crank out videos fast.
Odds are, if one is a serious hybrid shooter, you likely already own an external monitor. If for nothing else, my eyes strain looking at the back panel LCD. Using a 5" or larger monitor makes it easier on the eyes and allows for MORE video tools; better focus peaking, better zebras, better waveforms, and offers scopes, 1:1 and 2:1 zooming tools (while recording), offer multiple aspect ratio framing, viewing MULTIPLE audio channels simultaneously, and allows you to add external audio and ultimately bypass the camera's preamps (which often can be far less than clean.)