it is indeed very good if fellow investors are open to each other and explain how to choose a good and attractive project to invest without having to ask other people who do not understand the project.
The problem is we don't see that very often and that's probably because many investors are greedy and want to keep everything for themselves. If a good investor talks with another one about a good project, then the other investor do the same thing further there will be no room left for everyone meaning the first invertor that initially recommended the project will not get the full benefits of its investment.