All very good points, but let me clarify my point and move off the poor quality issue for a bit.
If you are a true DIY type, and know the dangers and risk of dealing with this equipment, more power to you. Will does target his videos at this demographic, purely on the products he reviews. I watch them for the same reason.
My issue is when he shows a "Have solar on your home for cheap." style video, or any other where it has something slapped on the wall. He is not including the cost, or going over the details on how to do it properly, safely and to code. Or even if the equipment has the correct fittings on the box to attach EMT or conduit and be to code. A 150V SCC with open screw terminals in the front exposed. An electrical inspector would have a fit.
My point is that the beginner DIY types, are watching a YouTube video and getting the idea that all it takes to add a inverter and battery to their home is hanging a box on the wall and cutting up an extension cord and they got a good system for cheap. They are not shown the steps to do it properly in Will's video. This is high voltage and high current electrical equipment. It should be handled and installed appropriately. The consequences to doing it wrong for the beginner DIYer are far worse then screwing up putting new tile in your bathroom.
So, how can this be fixed?
If the equipment is on the test bench, it's under test, this is clear to see and is fine by me. Portable battery in a basket is also just fine. RV/trailer type installs, I am also good with as long as it's indicated what the items are going to be used for and why.
If the intent and demonstration is showing how the product can be used in your home, it should be shown as how it should be fully installed. EMT, race ways, proper fuses, separation of the AC and DC side, grommets. The equipment should also be reviewed to see if it can be installed up to code. Aka, proper knockouts, clearances, etc. If a product is marketed for home use, but lacks the physical design to support being safely installed, then that should not be recommended for the intended purpose. If the DIY guy wants to try it anyway, they know the risk and the issues.
This would require more work on Will's part then screwing it to a sheet of plywood and running an extension cord in. He would need several boxes of EMT fittings, boxes, adapters, and parts along with the appropriate size wire. (most can be reused for the next review). But he would find out if the knock outs are in the right spot, if you can get 2awg wire in the terminal block like the manufacture says it support, and many other issues. This is all stuff I want to know before I think of using it in my system, or suggesting it to everyone.
As for boring 30k residential systems? Understandable. Lets check out how other people have done it. Viewers send in photos, zoom interviews, road trips. I want to see what other people have.
Now defunct HomePower mag had several spreads in every issue detailing someones home setup, along with a clear wiring diagram. It was one of the best things in the magazine.