It's a bit irritating to see someone basically take the information from all the existing answers to a question and combine them into a new answer with pictures and nice formatting.
Creative Commons Licensing
Because all content on all StackExchange sites is licensed under the Creative Commons Attribution Share Alike license, all content can be shared and/or remixed as long as proper attribution is given. This means users are well within their rights to alter, transform, or build upon your work.
What about edits?
While some users may choose to edit existing answers, there is no reason a better formatted answer that combines multiple answers should not be allowed.
All Stack Exchange content is licensed under the CC-By-SA content license.
That means that, provided that attribution is given, it's perfectly legal and acceptable for someone to take other answers and make them better, or "prettify and restate" them.
While editing is often the preferable case, there is no reason that a better formatted answer, or an answer that synthesizes multiple answers should be prohibited.
The problem case with answer restatements is when the restatement is of lower quality than the original answer.