I’ve been hearing that for years but its one of those “just so” statements that is a bit hard to actually prove.
I also still have one of those “luxo” iMacs. Right now its up in the attic but though I used it well past its end of support date (something like 6 years after purchase? more? cant recall) as a general desktop and have still put it to use for other things after that, I cant say I experienced any “security nightmare”.
FWIW I also ran a G4 Cube as an internet server long past EOS and again, didnt experience a “security nightmare”.
Not to continue bashing Cory, but these days the chops required are pretty damn minimal. Talking the talk and walking the walk arent the same. I’ll admit that I can no longer do ten pipe commands in POSIX without some RTFM nor write kernel code but either way as @orenwolf pointed out above, that I could do so in the past puts me in that rare blip demographic. Even rarer possibly, I’m someone who picked OSX as it was the unix I’d been waiting for. Most Mac users arent going to be like me but then again, most FOSS users I encounter are about the same level of chops as those who merely know how to build their own Windows PC and install from CD.