Indeed spending time on things that bring you pleasure but other people may not understand isn't part of that grind mindset, if you aren't grinding you should be sleeping and honestly if you are sleeping a healthy amount you aren't grinding enough.

Or something - "because I find it enjoyable" is a perfectly self contained reason as long as you aren't hurting anyone else (or yourself).

Gronk think, did man become so obsess with grindset that even forget like shiny rock? Even word based on grind stone. Once was, whole economy based on like shiny rock! Special ritual, give shiny rock for marry girl. Human like shiny rock seem very basic thing. Gronk wonder... what we become?

Maybe if you rub some AI on it in your pitch deck it could be acceptable to the HN peanut gallery.