Can't imagine why this push is necessary. One of the primary advantages of x86_64 as opposed to other 64-bit architectures is that normal 32-bit applications r

Can't imagine why this push is necessary. One of the primary advantages of x86_64 as opposed to other 64-bit architectures is that normal 32-bit applications run natively with no performance hits. As others notice, this is likely going to serve no other purpose than to make abandoned 32-bit applications completely unusable. Of course, it could also be related to Apple's intention to switch to ARM chips in the near future, and getting everything on consistent 64-bit to aid the porting effort. I can't imagine the developers are going to enjoy low-level mapping of 64-bit x86 instructions to 64-bit ARM though...