Writing your own OS/Browser/Editor/etc

Its like building your own home. It sure feels like you're in control but the effort wasted is not comparable with the little effect(low popularity, less use cases). People who dedicate their entire life to a software project as a hobby/work/noble cause are a different matter.
The idea of writing X because you don't like Y is just silly - you really want to dedicate all your life to maintaining and improving a piece of software, just because you're incapable of dealing with flaws in existing software?

>>10 I'm thinking of switching from C, debugging macros is not fun and the C preprocessor doesn't like complexity.
What are you using it for? you could just use the ideas in it and write your own smaller header.