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Please no, except perhaps for unusual form-like posts.

I have never experience seeded text to be useful.  It's actually a negative because it distracts and I have to delete it.  Seeded text is never what <i>I</i> want to say.  It also feels like an intrusion on my author's rights, and nannyish in general.

If a post has to conform to some very specific formatting, then it might make sense.  That would be very rare, however.  Perhaps recipes on Cooking fall into that category.  I am not familiar with them.  Even then, you have to be careful that it doesn't stifle creativity in those cases where an unusual approach benefits the post.  I don't think this feature would be appropriate for any of the places I have been here (which is pretty much everywhere except Cooking and Judaism).

By all means, provide lots of documentation.  In the end, though, it's up to each author what to write.  Then it's up to the community to judge that writing.