Can also emulate a PC in WASM to run Linux with a huge performance hit.

But I'm not even talking about Linux stuff, just basic use cases. Like a website somehow doesn't work with the iPad/iPhone, even if you forcibly request the desktop version. (YouTube creator studio live streaming is one example, or random airliners' in-flight video sites.) You need to unzip, manipulate, re-zip, and email something. Putting stuff on a USB stick for a print shop. Doing taxes. Running some Mac/Windows-only software.