There is a big difference in that WSL1 only needed to implement Linux syscalls, they could use glibc and all other libraries from the Linux distribution that yo

There is a big difference in that WSL1 only needed to implement Linux syscalls, they could use glibc and all other libraries from the Linux distribution that you are running, whereas Wine needs to reimplement all Windows APIs to work with most applications. Also, Wine is really a program on top of Linux, while personalities are a core feature Windows. At a low level, the Windows kernel is agnostic wrt. the system ABI. Win32 is just one personality of the Windows kernel, just as NT used to have an OS/2 personality to run 16-bit OS/2 programs.