They never set out to build the ultimate power user machine, their target was still general consumers. They just happened to have the right product at the right time when everything else just failed to compete.
Had desktop linux been in a better state, or had MS built WSL earlier, things might look a lot different today.
Here's a Titanium PowerBook G4 ad that says "Sends other Unix boxes to /dev/null": https://www.reddit.com/r/vintageunix/comments/b4kojo/sends_o...
Here's a snapshot of the software solutions page for the aluminum PowerBook G4 from November 2004, proudly touting Unix and even X11:
https://web.archive.org/web/20041126011836/http://www.apple....
Some quotes from the Power Mac G5 page (https://web.archive.org/web/20041126015955/http://www.apple....) from the same era:
"With the Power Mac G5, a researcher can now run both productivity applications and high-performance UNIX applications on a single system. Mac OS X Panther includes 64-bit optimized system math, vector and image libraries that take maximum advantage of the 64-bit G5 processor."
There was also a cluster in Virginia made of Power Mac G5s, which Apple also touted.
I also attended a marketing session at CERN, when they came to visit our IT department in 2003, when there were still people using Sun pizza boxes as their desktops (aka SPARCstation).
Anyone that has been around Apple long enough can recognise the old Apple (pre-OS X), on current Apple, now that they can be their old self.
Any good biography on Steve Jobs, like The Next Big Thing, Folkore or Cult of Mac, will show that underlying culture.
Microsoft had "WSL" earlier, only badly.
The only reason I started with Linux at home back in 1995, was the half hearted UNIX subsystem on Windows NT.
Had they been serious about it I am sure GNU/Linux would never taken off.
As shown by Apple sales of folks buying POSIX instead.
That market always bought the cheapest machine (or "best value", by specs/$) they could find (or, if they were really an "idiot", the machine that Best Buy had the highest commission on), which would be a PC.
In the beige days, Apple's bread was buttered in the publishing market, once they moved to OS X, they got the "professional nerds who wanted UNIX but not doing sysadmin at home".
I'd call the power user market that - the kind of idiocy that's more interested in the process than the results.
The actual target market was "people that have a life outside computers".