Who says I want 'discoverability', after all we are talking about useless project born of a hobby no?

Not everyone wants to have to share everything that is useless with the world especially if it's only going to be you.

I also don't want people to have to bug me for feature requests as well on top of that.

There is a reason GitHub/Lab/Bitbucket has private repos for this purpose.

You can obviously choose to share it, but you shouldn't be whining if your 'useless' hobby repository suddenly becomes the focus of attention of developers requesting more features.