NT kernel can and did implement POSIX. Multiple times even. That's how WSL1 works. NTFS can also support Unix-like permissions. There are ACLs for Owner and Group.

However, I'm not keen on using yet another Unix clone as well. At least Windows NT brought the world into 90s in the OS state-of-the-art where Unix clones are stuck in 80s and each of them patch around the deficiencies of POSIX. Native asynchronous APIs and truly object-oriented system call infrastructure is nowhere to be found in POSIX.