@AC "Just too many"
I can certainly appreciate many of the things you have said, indeed when I was reading it I wondered whether I had written it in my sleep until I got to the point about OSX.
You are, however, taking the Luddite view that I strenuously try to avoid. Yes, UNIX has been a good operating system (and my bread-and-butter) for the whole quarter century plus of my working life, but that does not mean that it will remain a good operating system forever. Like it or not (and I don't), genetic UNIX is now a dead end. Novell, SCO or whoever owns the AT&T code base now have no interest in reviving UNIXWare, HP/UX and Tru64 are legacy (thanks HP!) and the future of OpenSolaris is questionable, with the sands rapidly running out on Solaris for SPARC. This leaves AIX as the last actively developed AT&T derived UNIX (I'm ignoring the smaller companies, most of which are gone or going anyway).
OpenBSD, by the very nature of the court battle between Berkeley and AT&T that made it AT&T code free can only nominally be called a genetic UNIX (yes, I know about the V7 code base, I was around then), and I do not remember whether OpenBSD, FreeBSD, or NetBSD actually got SVID or XOpen accredited.
So what you now have is a diminishing number of marginally incompatible UNIX systems which adhere to a set-in-stone standard which is becoming increasingly unimportant, and Linux. If you look at where the technological change is coming from, it is certainly not from the UNIX community. Where have the latest X11 and graphics driver changes come from. How about the virtualisation technologies (and, yes, IBM use Linux as an enabler for their hypervisor). Web browsing, Multimedia, printer support, User interface. This work is all happening in Linux space and being backported on occasion to the UNIX base. This includes Perl, Python, Ruby, Apache and any number of other Open Source packages. And often, it is very difficult to compile these on AIX, at least, because of the number of additional libraries needed. This is a much more difficult problem than it would be on *ANY* Linux distro.
The number of people I now work with in UNIX space who EXPECT the GNU variants of the command set by default is now considerable. I keep having to bite my tongue to not remind them that GNU's Not UNIX, and they should not think that they are the same.
I work mainly with AIX, and I am finding that the number of pure AIX people I deal with is minuscule. Everybody who has an interest in computers outside of work is at least dabbling in Linux, if only to give them another career strand if and when AIX falls out of favour with the banks and government agencies.
So by all means immerse yourself in OSX as the closest thing to a genetic UNIX available on the desktop, but please do not regard yourself as a typical UNIX person. You're not any more. (Do you really use TWM as your window manager? I'll admit it's fast, but the word basic does not even start to describe it! If you do, you would probably feel very happy with fvwm on most Linux distros).
BTW. I'm currently playing with V7/x86. Now that is a true genetic UNIX, although not much use for watching DVD's. In case you are interested, it's running inside VirtualBox on Ubuntu 8.04 LTS, which is very suitable as a low maintenance Linux distribution.
Mine coat is the faded corduroy jacket with the leather elbow patches, and has the Lyons annotated UNIX V6 source in the inside pocket. Careful, it's like me, old and a bit fragile.