SEO Copywriting may not be recognized as ‘good’ to most website visitors, but it is recognized as good by search engines; that’s the difference. Your content must be readable and engaging, but it also needs to make intelligent use of key words, phrases and ideas that tells a search engine you are an authority on the topic.
For example, let’s consider Latent Semantic Indexing. This is basically an indexing method that finds words that will probably be used together on any given topic vs. just keyword stuffing.
Or Latent Dirichlet Allocation, a statistical model for discovering pages that are likely to be (mathematically) assigned to the same topic.
Said another way, a website devoted to baking should/will have topic pages relative to recipes, ingredients, where to buy baking supplies, baking tips and topics, etc. classes, etc. and not just packed with 500 uses of the keyword ‘baking’.
Google ‘knows’ that if you have a question about cakes, you might find the answer on this baking site, so it ranks that site higher for that search term. A good SEO copywriter writes accordingly.
Good SEO will never happen without useful, compelling copywriting, which adds significant value to your website.