From what I've gathered since I've started putting my pixel art here at itch.io is that everyones' idea what is "ready" (to be used by the game dev) is different and trying to appeal to everybody is a futile endeavour.
I don't see them as "not ready".
But I understand the need as well, so I'm happy to add a link in a description to a derivative project that changes the format - please let me know when you have it done, just put them into individual groups.
Regards