My point is that you have no way of discovering whether the fund manager you're thinking of investing with actually does that research. I know a number of people who work in asset management, I used to build software for hedge funds, and I'm married to an investment professional. There is a wide variety in the quality of research they do and their standards for due diligence. Some of them will personally build relationships with the employees and suppliers of the businesses they're thinking of investing in, so that they know of potential problems
before the CEO does. Others basically invest because their friends in peer companies do, with minimal diligence on the company itself. The former tend to do a lot better than the latter.
As a retail investor, you have no visibility into any of this. Most asset management companies will not let you interview their fund managers, and most fund managers won't divulge their research strategies if asked. You basically just get their pedigree and resume, which is useless.
With individual stocks, you can at least choose to put in the legwork to do your research. Or as sibling commenters have suggested, you may get it tacitly by being embedded in the same industry as the company you're thinking of investing in. Someone who works in tech and is a user of AWS is in a much better position to judge the importance of a new AWS product announcement than someone who covers Amazon as an outside analyst.