You can't just reduce Lilith's Throne to the main story, the sandbox mode is imho also a huge draw of the game. I think a small part of the discontent with Inno comes from the mismatch between expectations. I'm coming back to the game like once every 6 months or so, and try a new playthrough just for the sandbox. One time I collected all the flying morphs (harpies, bats, owls, pegasi, etc.). I would really love for Inno to expand the sandbox more. I'm happy every time the mansion gets more content. The spa was good, dining rooms were good, etc. Of course, mansion upgrades are about as rare as main story updates, and mostly have as little content as main story updates as well.
But I do like my text-based Sims slavery simulator, and I wouldn't be unhappy at all if Inno were to announce that there will be no further story updates, and that she will focus fully on the simulation side.