ntfs-3g is adequate for me, so I don't care one way or the other if _this_ driver gets merged. And Linux is not a commercial OS, there's not some prioritised backlog controlling everything goes in, a lot of the time its what someone is willing to make the case for and sonmeone is willing to put in the work for inclusion/support. See all the esoteric/obselete cpu architectures that are still supported in the kernel - there are absolutely more users mounting NTFS drives than running Linux on PPC for example.

However, "mounting windows filesystems" is undeniably a more common case for Linux users as a whole than "mounting amiga filesystems". Maybe WSL changed this, but Windows/Linux dualbooting used to be one of the two gateways for Linux users alongside VMs. Perhaps the absence of a apfs-3g is a contributor we see less Mac/Linux dual boots.