And so either the output is something that only helps me or it's something that's generally useful to others and maybe needs last mile tweaks to be ready for prime time.
If I did agile poker and code commenting and stuff it would take all the fun (momentum) out of sitting down at my home desk after hours at my work desk.
I should say, your answer is completely correct - particularly for motivated people - and not incongruous with my perspective. I just wanted to spare a thought for the things that make personal projects fun. I just would only do requirements gathering over a beer.