I don’t think I follow the point you’re trying make. Are you trying to say Rust compile times are a problem for you on your 13 year old laptop in the context of writing GUI code on battery? If so I think that’s such a specific scenario that it’s hard to draw any generally applicable conclusions.
I also own devices like laptop graphics workstations.
The point I am making is Rust only for those with enough income to buy hardware powerful enough to have a usable workflow or for anyone regardless of what hardware they can afford?
As for coding on the go, classical desktops are a dying breed.