I have tried many, many website editors. Wix is one of the better ones. Among the big three managed website builders of Wix/Squarespace/Weebly, Wix has the most powerful editor. Sure it's very unintuitive if your are a frontend web developer. But it maps very well to pre-2008 desktop application builders. Take a look at the Retool editor if you want a better explanation. The ideas behind them are similar; rapid development based on pixel grids.

You can divide UI editors generally into two categories, those that allow arbitrary positioning and sizing, and those that don't. Those that don't are much more familiar to web developers as the underlying structure is based on relative positioning for different screensizes. In other words flexbox and breakpoints. It is also easier to use variables for fonts and other elements as there are fewer hard constraints. But if you try to use a website (or any UI) builder without arbitrary drag and drop, it gets very frustrating as your UI feels as if it is "stuck" to a particular design. Weebly and Squarespace don't even allow much changes to layout at all by the visual editor outside of pre-built components so they are significantly less powerful than Wix relatively speaking.