OP did just say M5 (implying the base model)

Those speeds on the Pro/Max are impressive though, more in line with Gen5 NVMe drives. Those have been available in desktops for some time but AFAIK the controllers are still much too power hungry for laptops, so I think Apple's custom controller is actually the first to practically hit those speeds on mobile.

It's been done, the ZSNES emulator had an exploit where a malicious ROM could run arbitrary code on the host. But ZSNES is written almost entirely in assembly so it was always kinda asking for trouble.

I'm seeing ~6GB/sec: https://www.tomshardware.com/laptops/macbooks/m5-macbook-pro...

That's decently fast but not especially remarkable, most Gen4 NVMe drives can hit 6-7GB/sec.

They don't: https://forums.dolphin-emu.org/Thread-dolphin-donations?pid=...