The problem is that if you remove post there is no place to direct poster to a better topic as there should be the new moderation started topic about removed old one and the "better" already existing one. Pointing to any post with gathered so called "good rules of thumb how to write posts" makes no sense as almost none follow them.
On the other hand there are a lot of complains on interfering with posts as moderators are not expected to "know better" than OPs. On the other hand non interfering with posts is assumed to be laziness or ignorance in the moderating "sport".