This is a fairly common and obvious rule, and everyone knows it. But unfortunately it is violated very often. Therefore, I believe that it will not be superfluous to once again remind novice investors that they should not forget about diversification.
Often people do not understand the most important thing. This is what is important in the project, not what he is going to do in the future, but what he has at the moment.
As a rule, people looking at a project look at its promises, and not at an existing result. Which subsequently leads to the fact that the project is not able to solve the tasks and closes. And people who had high expectations regarding this project remain fools.
Of course, I completely agree with you that each investor first of all pays attention to the professionalism of the team with which he is developing his project at the moment, because any promise of future development should be supported by real actions that are carried out for this period. This of course is an integral part that should be present in a promising project. Nevertheless, I still constantly pay attention to global plans for using the project and how much this product will be in demand in society.