I think you misinterpreted their message. Their argument is that it's an expectation that the professional RTFM (more accurately, to have already done so) which shouldn't carry over to hobbyists. At least not as strictly. Put another way, "The certified Toyota technician needs to have the fancy book learnin' while the weekend wrencher or shadetree mechanic shouldn't be held to the same standard."
I disagree insofar as, short of inaccessible resources (sadly becoming more common in my automotive example) or a lack of time and money, there's no reason a hobbyist shouldn't strive to educate themselves and achieve professional level of excellence. So long as they enjoy it, anyway. That's really the point of a hobby.
set -o vi:D