My gut reaction is no, they're not good.
I can't disagree, however, that audio (and video? I can't speak to that) product cycles, etc. are different than say, computers. Asking about the best microphone can include products from the last 50 years!
What irks me about the shopping recommendations is not so much the localization in time for future visitors, but rather, that it inevitably ends up as a list of products, or options, or whatever... an infinitely amendable list. There will always be new input as to what the new tool is. It's like an ever-changing google search.
Those questions just don't lend themselves to an answer.
Rather than asking what the best mic for recording a solo cello is, one could do a bit of research, come away with a few questions about which of these two or three are best suited, and ask a question that can be answered. That's not saying, of course that there wouldn't be opinion involved, just that eventually, the relevant opinions would likely become exhausted on the subject... no infinitely amendable list.
It's a slippery slope to be sure. And this site, perhaps more than others, can probably actually manage more shopping recommendations.
After writing this... I'm still on no.