It’s not a waste of resources if you learn something. Think of this as research rather than product development. You can try many things (from VR, to miniaturised computers, to cloud gaming, controllers with wonky form factors…) to see what results in a good experience. You don’t need to get anywhere near a full fledged product to understand those things, so the waste of resources isn’t massive anyway.
I’d bet at the moment people decided “this is useful, I even want this for me, so let’s turn it into a product” the steam deck looked more like a screen, a gamepad and a raspberry pi all taped together or jammed into a 3d printed prototype chassis.
If people have spare capacity to work on these projects, the material cost at such a point can be under <5k which is peanuts for a company like Valve.
My take is that best case scenario you’d arrive roughly at the same time you left.
If you have breakfast in London at 8am, then make it to the airport by 8:30, you’re at the gate at 9:30 after one hour of security and controls, and you’ve made it exactly at the time when boarding starts, which usually is 45 minutes before takeoff on most airlines. You take off at 10:15, arrive at 11:45 (which is 6:45 local time), then still have to go through half an hour of border control and getting out of the airport, and then another half an hour to get to the city centre and have a coffee.
You’d still arrive at about 8:30, but I don’t see the whole ordeal taking any less than 5 hours.
I routinely take a 1.5 h flight to visit my family and while I’m a fair bit away from the airport, I don’t think I’ve ever managed to get door-to-door in less than 8 hours. 6 if we are measuring departures lounge to arrivals.