Because I do not respect the brands or general reputation, so I would like to know if there is substance underlying the reputation. If the reputation is built on truth instead of marketing, I would hope that there are examples of substance where they achieve what their reputation says they can do. I believe this an appropriate general strategy if one does not believe in the reputation, so this is not really an unusual level of scrutiny, it is just that I do not believe in the brand where as you do (not that there is anything wrong with that).

As for random commenters, since I can not use the reputational apparatus for information, I would need to get direct information. There are likely people here who work with the stated individuals, so there is a non-zero chance I could get that information. Hopefully random commenters would not lie for no reason, but to deal with that I avoid incorporating information that can not be cross-referenced.