Similar questions have been asked here before, for example Are we creating too many different Stack Exchange sites?, but my point is slightly different. I have absolutely no issue with the total number of SE sites, on the contrary. However I don't think it makes sense to split topics if there is a high correlation between the users interested in these topics. Here is an example which I personally find a bit annoying:
The Stack Exchange site which I find most helpful and in which I am most active is Stack Overflow. Now as a professional software developer I am not only interested in coding issues but also in topics like project management or requirements engineering which become more and more off-topic in Stack Overflow.
To ask or answer such questions, I need to go to other sites like Project Management or Programmers. Especially the boundary between Stack Overflow and Programmers is far from being obvious.
I would find it much more convenient to have all software development related topics on one site. Of course this is my personal opinion but many questions, answers and comments give me the impression that lots of other users have the same issue.
Am I missing something?