"I've encountered a lot of people who sound like critics but very few who have substantive criticisms. There is a lot of skepticism, but it seems to be more a matter of inertia than it is of people having some real reason for thinking something else"

This quote by K. Eric Drexler is referring to the problem of discovering individuals who are willing to put in the effort to make meaningful criticisms. He is stating that there are many people who are skeptical of ideas, but they are not necessarily doing so for any real factor. Rather, it is more likely that they are just being resistant to change and not wishing to put in the effort to understand the concept. This quote is a reminder that it is very important to look beyond surface area level criticisms and to really go into the details of an idea in order to make meaningful criticisms. It is also a pointer that it is important to be open up to new ideas and to be happy to put in the effort to comprehend them.