Proton technically isn't emulation, but it's pretty crazy that the device basically doesn't have anything natively built for it, everything is translated emulated. It took that much effort to break Microsoft's PC gaming monopoly.
Sadly that's mostly true, but that may have more to do with devs lack of experience with Linux in general. Often they would have to outsource the port to Aspyr or another team.
Regardless of what the website says, waydroid isn't an emulator by any meaningful definition.
It's a container that runs on top of your regular linux kernel (with some very cool desktop integration features), java/kotlin applications run as natively as they'd run on your phone.