Simple: It won't. So long as it's an open ecosystem, there will always be fragmentation of user experience due to third party software vendors not being aligned with each other. For the same reasons WordPress has immense strength in its flexibility and rapid development capability when in the hands of the right person, it also lacks the utter simplicity you might find in tools like Wix.

Simply put, when in the hands of a capable developer, a user experience that far exceeds that of Wix is possible with WordPress, because it can be tailored to the client. When in the hands of a power user, much can be accomplished, albeit with a few pain points that may require help from someone more skilled.

Conversely, Wix will never have the flexibility and power of something like WordPress. It's not possible with a closed ecosystem. Even with a large development team, giving a customer too many options sacrifices the very simplicity that makes Wix successful.

You just have to lay out your needs and desires and choose the tool that best suits you. Help from a skilled individual also goes a long ways in making that decision.