Even though our agency is representing the Wix SEO Haters, we must admit that they have made a ton of improvements.
Yes, historically, they were awful and often wouldn't even appear in SERPs.
Now, the issues they still face are the following:
- Poor page speed
- Non-customizable sitemap or robots.txt file
- Lack of structured data capabilities
- Not a ton of advanced SEO capabilities in the Wix SEO Wiz tool.
But, despite all of that, John Mueller from Google has said websites are websites for Google.
So, while it's not the ideal platform, it's a viable option for small businesses or freelancers with limited budget. However, I'd always recommend using a more advanced platform, such as WordPress.