Producing a 1.10.x pack at this point just doesn't make sense. A pack that requires the time investment into producing it that an Expert style pack requires isn't justified if you are producing it for a version that no longer has widespread mode support. We want our packs to last more than a couple of weeks and we'd like the opportunity to work with mod developers to get bugs fixed as they are found. As has been mentioned, most mods are now being developed on 1.12.x and backwards support is often limited.