@OneGrenouille yeah, I think there's a fair bit of people reevaluating how we use content-warnings in the fediverse at least as far as microblogging. I think your understanding (as I understand from a sibling thread) is basically right: CW for things that you know of as triggers for people dealing with trauma or maybe addictions or phobias so they can decide whether to engage.
Besides the above, I think it's more about how you want to curate your image and engagement since most will have more agency to disengage outside of those (non-exhaustive) sensitive categories.