I think the purpose of posting the hijack logs is grossly misunderstood! Although I' don't interpret these logs, occasionally I will view one. And the person posting may have said something like 'my computer is slow', check my hijack log' with no other information.
Basically many users don't know where or how to begin troubleshooting- for instance, using the msconfig utility to stop unnecessary programs from starting up and running in the background!
I think posting these logs in some cases is a waste of time for the person who must run the scans and for the person who will review them because of this. Running HijackThis, posting the log and having it reviewed should only be done when there is a known malware or an indication of malware- not as a way to 'streamline' a computer system.
An advanced user can also handle their own log- the keyword here is "advanced".
So to answer your poll questions: I would have to say Yes, No and Maybe.