Keeping the original answer below, but let me rephrase: Not everything that happens to your post is related to giving you an answer. We can edit even without knowing the answer. We can choose not to answer because we don’t feel like it, we don’t like the question or our supervisor is nagging us to do some work-up. Answers are voluntary.
Usually editors don’t comment when they edit because it is, sorry, bloomin’ obvious what the edit did/was supposed to do. Sometimes they don’t even leave an edit summary. If at any point during the edit the editor feels that it would be worth to drop a comment to help the user in the future, i.e. by linking them to the relevant meta posts, they will do so.
Remember that on Stack Exchange, posts are not ‘yours’. In fact, it is Stack Exchange’s policy that the only thing that is yours concerning a post is the reputation that you gain (save community wiki posts). It is up to the entire community to improve posts, remove spelling errors, rewrite sentences, make them clearer, improve formatting etc. So what you are experiencing is normal Stack Exchange behaviour.
And of course, leaving answers is totally unrelated. I can edit posts even without knowing what the answer would be. So why would I answer?