It’s not about elitism. It’s because most developers don’t want to spend that time on the extra maintenance and QA to ensure it’s working flawlessly for the end user.
Most FOSS are just things people initially wanted for themselves, so they developed it in their spare time. Then they thought it might be neat to share the code in case someone else might find use in it, so they uploaded their work to GitHub.
If you want an exe you can always contribute to the project, or at least make a fork.