Eh.  Mac's are a little more flexible.  The main Poser-related thing that doesn't work right is Python; too many Python items use a library that was never properly ported to the Mac.  Fortunately you can write a Python script without it (see PhilC's stuff) but few developers do.

Most Mac users are quite capable of dealing with manual install (there's a couple of nice third-party installers), and strange file type rarely croggle the experienced user.

Most of the trouble I've seen is going the other way.

By the by, to the OP, the method I described is the Power User method.  It allows you to do tricks most of the third-party aps won't....MAT-DIV poses, for instance, or HIDE/UNHIDE poses.