Thanks for sharing the experience! At Rustup we're also getting ARM64 Windows-related requests recently, so I'm very curious about how well these machines actually do as a daily dev workstation. Looks like your Yoga 7x performs even better than I thought it would!
I'd like to add that actually there is an official prebuilt Rustup binary available for you at https://win.rustup.rs/aarch64, maybe that will lead to less translation overhead for your Rust workflow :)