However, I would say that's the price you pay for an independent reviewer these days. He's (presumably) not simply reading a carefully prepared script by the vendor. That he actually pays for all the things he reviews is astonishing. Likewise, I'll forgive him the occasional bad video.
Speaking of, in the electrical tape video you mention, he tests for things he cares about. Presumably you would have want him to test resistance I presume? I would think so too, but in doing some research while responding to your post, that doesn't seem what anybody actually cares about. Most tapes advertise heat resistance only. I can't actually find a mention of tape in the NFPA, aside from checking it for heat-damage, which makes sense as in house wiring you would be using wirenuts, not tape to actually bridge and insulate connections.
Frankly, I can't think of a single time I've ever cared about it being an insulator since I was a kid hacking together batteries and wires. All that said, on second thought, I guess his video is fine after all; in my book, at least.
Things that matter in electrical tape to me is flexability when wrapping wires. And how well it lasts in the sun. I get that the later test takes awhile. He has done a of couple year long tests but I get why thats rare.
It is hard to explain the difference in cheap electrical tape but if I was to take cheap tape and super 33 (or 88 which is a bit thicker) and wrap something with it the difference in how well they conform is night and day. And the adhesive itself is also a lot better.