I use Linux instead of FreeBSD because I'm old and lazy. I used quite a few alternative operating systems in the past. BeOS was my main OS for a while, for example. It was a great experience but there were also many drawbacks which required fiddling. And fiddling is not something I want to be required to to to make an OS usable.
I only run desktops and in the end it boils down to hardware support which is less of a problem under Linux, eg. Intel directly supports Linux while the GPU drivers have to be ported to FreeBSD at a later time.
I do not interact with the kernel myself, so I do not care about kernel APIs and such. I rarely use the command line these days, so the 1980's GNU userland vs. BSD userland debate does not matter to me.
Because I've tried it and it was crap ? That a good enough reason.
Now let me explain a bit ... I just installed FreeBSD on my PC , an AthlonXP with nForce2 Abit MB and on the first boot it just froze ... probably some ACPI or some driver problem. OK, no biggie , I just hard reset ( it was really frozen so no other way to do it ).
I reboot prepared to give a shot with ACPI disabled or something and guess what .... file system got corrupted , beyond repair ... UFS something ... I've hard rebooted Linux and Windows tens of times and never was the file system beyound repair ...
Besides Linux is exotic enough as it is , HW support is not the best and SW (proprietary ) isn't that well supported either ... FreeBSD only makes these issues worse, sometimes much worse.
Also if I had a company I'm not sure I'd take FreeBSD seriously, performance is lacking almost all the time compared to Linux and you can't get support from a company like Red Hat or SuSe ... you can get it but I really trust these 2, especially Red Hat.
1) Linux is way more fragmented with the hundreds of distros (in fact, some authors prefer to talk about "systems") compared to the couple of *BSDsIt's fragmented, uses crappy license, its file system sucks, it's slow, it's old, legacy, lacking man power and automation, it's MS and Apple friendly, people from foolBSD forums are trolls etc. and Linux is stable, reliable, fast, has greatest community and license etc. If people have adblock turned on then such stupid articles won't bring you too much profit.
2) Well, it's your own opinion and taste, we had enough flame wars about licensing ... and I could't see a SANE argument against the license , none (no, repeating other peoples argument without the understanding doesn't count)
3) Which one? UFS2, ZFS, ext, fat, ¿?
4) In which subsystem? please, provide proper benchmarking. Take, advice for benchmarking for nubes : http://wiki.freebsd.org/BenchmarkAdvice
5) Well, actually 1.0 came 3 years after the first version of linux, so FreeBSD is actually younger | "If 386BSD had been available when I started on Linux, Linux would probably never had happened." Linus Torvalds
6) Ambiguous term?
7) Yes, it lacks man power for sure, but it doesn't lack automation (the tinderbox, for base and ports)
8) Well, we are linux friendly too, remember the story of the atheros driver? (I don't want to resurrect old flames about it, really)
9) Some of them, yes ... people at linux forums also have trolls, and in fact a quite annoying type of troll
The rest, well, it's your opinion