@njms the nice thing about good social media is that it allows choice. You just replied with an unlisted post - we could make it that only public posts get indexed so people who don't want it can just post with any more restrictive reach like unlisted to not be affected. This is what you could already have been doing if you want to keep your posts to yourself and your followers.

Public posts however should be indexable. They're literally public, it's in the name, you give consent to them being public literally when choosing that option.