Having worked with WYSIWYG web editors dating back to Frontpage and also Wix the critiques here are similar to all editors — they’re finicky and quirky, slow to load, and hard to do truly custom things that go outside their templates or rigid systems. Wix is neither better nor worse. If you can work with it great. I advise a couple of nonprofits and i set them up with wix not because it’s super customizable or fast, but because it’s useable by laypeople and hosting is included.