Of course, and I’m not knocking the FEX project. I’m just pointing out that there is no native solution to running programs built for other hardware architectures (other than a port adapted from source).
The PS3’s CELL is just so egregiously unique that it has a massive emulation overhead compared to ARM or any other more common/simple hardware architecture - less understood overall, and less understood in how it can be translated to x86 compared to ARM->x86.
Gabe Newell famously participated in an interview about the same subject when porting The Orange Box, and as a result handed the port off to EA (which ended up running like dogshit compared to all other platforms).