"OnyX will run all the scripts, clean out caches so they can rebuild so they are slimmer, do other cleaning and troubleshooting aspects."
Indeed. ๐
"Far as Unix level maintenance it's really not necessary now` in 10.6, or else Apple would have included it in every OS X reboot."
Do I really need to point out the logical fallacy in that?
"If the machine is running 24/7 then it more necessary as the log files can grow quite large, that's why it's set to run in the middle of the night when most people sleep."
Your inside source from Apple confirming that's their reasoning? As you well know, log files can grow extremely large in many other circumstances (so I'm not sure why you make comments like that).
"I run all of OnyX's cleaning and maintenance aspects about once every few months or so, just for the **** of it, because I like a very lean and tight running machine, it's more for my pleasure than anything necessary."
So you're saying you believe it's useful to you, but not to other people. Hmmm. Well, I agree with the first part; I also run it periodically.
I think I've given an accurate picture of things, so I'll leave it to perceptive readers to see the truth of the matter. ๐