Life and Death Expansion question

I think you will be safe. I love the pack and I havwe no plans of focusing on the soul features or playing grim. I tried the bucket list once, but my sim was then sugested to max a skill that she was totally not interested in, as her first goal, so I just ignored it after that (I might have chosen something not so smart when checking the feature). I don't see ghosts in other worlds than Ravenwood. Well, in one case a Ravenwood ghost started to show up in a house in a different world, at night, but it's easy to just click "just go away". Streets are not flooded with ghosts like they can be in Ravenwood. And I never saw Grim either. The world is great, at least it triggered lots of story telling on my part. I like the funeral/memorial feature.