The “normal” way of starting a puzzle is to start with the edges. You can find the edge pieces easier due to the flat side, which makes it a good place to start when you have many pieces.
You have to spread all the pieces out when you get them out of the box, so it makes sense to separate out the edge pieces while you’re spreading and flipping pieces.
Early timber bridges had their drawbacks. Untreated lumber only lasted about 20 years and locomotives could easily cause the wood to catch fire. Collapses - rare today - were a regular occurrence on logging railroads and there are numerous accounts of train crews that regularly hopped off their slow moving locomotive as it approached a high, untrustworthy trestle, allowing it to cross before they would then run across the bridge and jump back on.
When I had Plex play trailers, it was only ever before movies, with trailers for movies. Seeing it every time you watch an episode of a show is too much.
You’re right that robots aren’t going to be able to replace plumbers or electricians in traditional building projects.
But why can’t we change how new buildings are built so the method better suits robots. I’m sure with current technology we could design a building that could be built entirely by robots.
I don’t think it’ll happen because it will take a lot of time and money to develop such a holistic system, with no return on profit until it’s a complete system.