But is it a necessity?
Posts like this one is why regional communities on the dead site had rules like this. So yeah it can be argued that it's necessary.
Generally my flow with writing a typical article-based Lemmy post is: Article title or one-liner paraphrase of article in the header, more details/summary in the body staying mostly neutral with only a bit of my opinion, and my full opinion on it within a separate comment.
That fits within the intention of the rule in my opinion.