Maybe I've gotten something wrong here, but as far as I can tell, Wix and Squarespace are entirely closed-source hosted solutions. This might be a small and hard to verify decline, but it still makes me kind of sad to see more things moving from something you at least can host yourself if you want to something entirely proprietary. Wordpress may have its warts, but you can still actually get the code, and it still works mostly okay and can easily be hosted yourself in a wide variety of ways. If you want to hack it to do something weird or crazy, you actually can. IMO that beats locking everything into some company's system that you may not be able to extract or change.