Because motivated, high performing people need to have control over their own destiny. Because cookie-cutter solutions which work for 90% of use cases are often worse than something explicitly tuned for you.

People having specific needs, getting frustrated and then solving their problem is a feature of opensource code. Its not a bug. It is the engine of innovation and improvement. Forking means we can both get what we want, even if our needs are contradictory or we don't want to work together.

This happens with commercial offerings too - but its a mess. You can't just fork the code without paying (or sometimes at all). And every fork is private, so work is duplicated and collective learning doesn't happen. Expensive consulting-ware might be the best case outcome.

The ability of motivated people to fork projects and have their own spin on things is one of the biggest strengths of opensource. May the best forks win.