IMHO these are unrelated problems. There's nothing preventing those 'handmade' libraries from using memory-safe languages and development practices, or calling into accessibility APIs provided by operating systems (assuming they are provided by operating systems), and on the other hand, Electron is the opposite of the 'handmade philosophy', but is still not accessible.

There's required complexity, and unnecessary complexity, and the latter is the worse problem in modern 'industrial' software by far, because industrial software isn't developed by customers needs, but by business needs, and the gap between what customers want and what the industry provides seems to widen more and more each year.

This 'industrial software development' that doesn't serve the user anymore is what the handmade philosophy is providing an alternative to.