Because people have been doing so for a long time and have ironed out most of the quirks. The software is also generally quite simple, meaning there are just fewer quirks that need to be ironed out. And the ecosystem is largely open source, meaning everything can be recompiled to target the relevant architecture, so while translation layers are still useful, they’re not the essential tool they are in proprietary ecosystems. The main headaches that plague windows on arm mostly just don’t exist on the Linux side.