I've redrafted this post about a billion times, so I'm going to leave it as

"It's fine if the contributors to a FOSS project focus on the bits that interest them.

You don't owe anyone your labour, time, or skills. Feature requests and considered feedback may be welcome, but they are invitations, not obligations.

You've already gone above and beyond by releasing your code under a FOSS licence, to enable others to benefit from it too."