You are right that Windows on ARM cannot be called a success. But if you make Windows/macOS cross platform software then your software needs to be written for A

You are right that Windows on ARM cannot be called a success. But if you make Windows/macOS cross platform software then your software needs to be written for ARM anyway. So if you support macOS/x86, macos/ARM, and Windows/x86, then the additional work to add Windows/ARM is rather small, unless you do low-level stuff (I remember Fortnite WoA port taking almost a year from announcement to release due to anticheat).