Gamedev here: For non-indie projects it’s not up to the devs to decide which platforms get a native build. That decision is made by the publisher, and usually depends strongly on the estimated amount of extra work needed to make a native version. I agree with your statement, that if devs use ARM development PCs, they get a strong argument to convince publishers to pay for a native version, because porting costs will drop to near-zero.

However (there always is a “however”): Many devs cannot switch away from Windows. If one develops for PC only, it’s possible. If one targets other platforms too (think: game consoles), one is stuck with whatever development environment the manufacturers of those platforms support - what is typically Windows and Visual Studio. It is kind of a chicken-and-egg problem. Platform SDKs will be made available for other operating systems or processor architectures once enough gamedevs are using those. Gamedevs cannot yet use those because platform SDKs aren’t available for them…

It’s, to be honest, a frustrating experience… I personally would switch away from MSVC and Windows the moment I get an opportunity to. However, there never was an opportunity up to now… Our previous tech-director was pushing for Linux on dev machines - or rather: “let the devs use whatever they want, as long as it works” - but there never was an opportunity to switch, due to our games’ target platforms allowing only Windows for development…