It’s also very easy to come up with bad ideas — I did plenty of that and I still do, albeit less than I used to. Finding an idea that is novel, interesting, and tractable given your time, skills, resources, and knowledge of the literature is hard, and maybe the most important skill you develop as a researcher.

For a reductive example, the idea to solve P vs NP is a great one, but I’m not going to do that any time soon!