Sensitive content warnings
This is a bit of a prickly issue at best, but a consensus was reached with discussion on the fediverse for my proposed system to make spoilered/CWd/whatever messages read as follows:
This text is shown to everyone #nsfw (or #cw) This text is shown only to people who click through the spoiler (or those who have spoilers disabled)
This degrades very gracefully compared to existing systems since the text and content warning itself are preserved in full.
This can also be expanded, by allowing a user to select a hashtag or hashtags that are automatically spoilered for them, by putting them in a list in their profile settings.
Server tagging is also an idea we discussed that we can further expand upon once this baseline feature is added.