Apps are broken

It's more complicated than this, but as a simplification:

most features in software are never used

(https://www.standishgroup.com/sample_research_files/Modernization.pdf)

This means that it's not really worth developing too many features. (and feature development is really expensive!)

Most software is developed so that it is useful for the lowest common denominator. I don't know what sort of software is needed to fix my funky brain, but it's probably not going to be directly via any consumer software.