Developers are working on a Wine port to Android ARM processors. They were able to run Windows Solitair on an Android platform. Of course it ran slow because it was emulated on a Macbook, but imagine the possibilities when its optimized?
The biggest problem is the difference in CPU, so there's a requirement to emulate chunks of the x86 platform - that's going to tend to slow stuff down. Yes, you can recompile x86 instructions at runtime, and that would increase the speed, but it's a much bigger ask than catching OS calls.
I've heard the same thing. x86 to ARM is always going to slow things down instead of just using x86. But processing is getting so fast these days, can't blame them for trying.
