Idk about pre-orders but I’d imagine it’s a combo of many things, from Xiaomi already having the finances, to tax breaks and subsidies from the CCP, and subsidies on the domestic consumer side to encourage adoption to further stabilize the industry, which further encourages investments.
One case where I find it useful, tho it operates in a more limited way, is code in block blocks within code comments in Rust, which are also printed out in the generated documentation. They essentially get ran as part of your unit tests. This is great for making sure that, eg, your examples left in code comments actually work, especially if they’re written in a way that functions like a unit test.