I agree wholeheartedly, and this is the core problem - many of the people evangelizing LLMs for a particular task (especially investors and AI gold rush "entrepreneurs") do not have enough expertise in that particular field to effectively evaluate the quality of the output. It sure looks the part though, and for those with a shallow understanding, it is often enough.
Unfortunately, too few people are making the obvious leap from "LLMs aren't great for topics I have expertise in" to "maybe that means LLMs aren't actually great for the other topics either."