Ugh, this is exactly why I find his video kinda misleading and unfair. It’s one thing to test the durability, but its a completely other thing to basically frame the device to consumers as a fire and explosion hazard by doing things to it that no normal person does, even by accident.
The claim that in the last 10 yeas no other phone exploded probably lies in the fact that phones were mostly not foldable and double the thickness. The iPhone 6 Plus bent just as bad, just not at the place where the battery was. He said it himself, he probably punctured the battery while bending more the already bent and shattered phone.
He, for what I can remember, also didn’t bother to explicitely mention that this is an extreme case and it could happen, but tries to play it casually like Google has a massive issue and he “just used the phone as normal”. He created bad publicity, surely attracting many many views by framing this as something unexpected and controversial.
If he started punching all phones for a test, they will all go up in flames.

Probably just register as a hobby developer and in worst case scenario sign apps I build from source with my own key and install them on my own devices, in case the original developer is not registered. None of the information I give google is new, they know all of that probably long time ago, and I don’t plan to distribute apps, just install them myself.
This seems like a macOS system where you can install apps from outside of Apple Store, but it still needs to be a registered developer. It’s not THAT bad, as it may initially look like. Just remember the old Android Marketplace with tons of shady fart and flashlight apps.
But, I bet there will be a root workaround for that so… no worries. Root, disable, hide root, enjoy like nothing happened.
Because 99.9% of population doesn’t know what sideloading is, let alone where to find apps and how to sideload them. So, realistically, there isn’t a need for it. Also, Google apps tend to be free with IAP, so no matter where the app comes from, it can still generate them revenue. On Apples side, their apps are mostly paid once upon purchase, so enabling sideloading would effectively cut revenue.
It’s like saying I don’t like drinking water from planet Earth. Good luck with alternatives.