Why hasn't someone made good software for EEs to use? And if the have, why do no EEs use it?
That's my read on it, anyway. Anyone who figures out a way to make EE CAD software better and easier to use stands to do well for themselves.
The best stuff is usually pretty expensive. Although Altium is making lower cost and free versions available with their CircuitMaker series.
1) Barrier to entry is way too high compared to other software niches. Good luck designing a cycle-accurate CPU simulator, or creating a reliable and robust analog circuit simulator that competes with offerings from EDA giants like Cadence and Synopsys.
2) The adoption process. I learn tool X in school, I start a company that uses tool X, I teach my hires tool X, etc. Once tool X becomes a central part of the design process, it's almost impossible to get rid of it.