Tech didn't cause this, homeowners did. If it didn't have a high paying industry you'd see blight and disinvestment instead, as you're only left with retirees who don't care about that stuff.
Seattle has unusually good building codes (single-stair is allowed) but no income tax, so in that way it might not benefit from tech as much.
Rumor has it airbus used to have a secure cabinet of Boeing analysis data that people would go reference once in a while in the 90s but I doubt that happens anymore
You can already kind of side load via test flight. I don’t really see any additional risk. It will add a lot of additional complications for apps that relied on side loading not being allowed as part of their security plan