Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
UNIX was a terrific workhorse for its time, but eventually the old nag needs to be put out to pasture. David Chisnall argues that it's time to retire UNIX in favor of modern systems with a lot more horsepower.
In the last decade, free clones and derivatives of UNIX have started to take over from the old-guard UNIX systems. In terms of source code, these versions share very little, if anything, with their predecessors, but in terms of design and philosophy a lot can be traced back to the original roots.
UNIX has a lot of strengths, but like any other design it's starting to show its age. Some of the points listed in this article apply less to some UNIX-like systems, some apply more.