This was a blurb in some of the answers:
"Before we continue I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for informational purposes only (general sizing and budgeting) and is based on the information provided by you. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted."
I think that covers the standard of care problem. Personally, I'd rather see the "expert" not go into a calculation, and just explain how that's not how the profession works (ie, asking for this stuff over the internet for $30), and instead offer a road map on how it's supposed to be accomplished. But the whole site appears to be geared towards "why pay hundreds when you can log on from the comfort of your home for a fraction of the cost."
On the flip side, I do see answers there that don't provide any sort of calculation at all, and are generalized responses like "in certain situations, one could run into a problem with that modification, some of which are A, B, and C, and regardless of the case, this type of professional should be called to have them look at it", or "the manufacturer should be contacted with this question." That's more of the road map that this should be limited to.