Website building seems to be one of those edge cases like transcription/translation where AI is indisputably useful. Allow me to explain...
Watch normal people use these "vibe coding" tools, and what you'll see is them spending the majority of their time and attention on the UI. (No wonder, it's what they can see and comprehend.) Very little if any attention given to the logic. (Hopefully the bot got the vibe right.)
Many "small business"-type websites are just informational, or have a very simple contact form. This is exactly Wix's target market. Logic in the code isn't particularly important on these simple sites.
I haven't looked at Wix in over a decade (I was actually serenaded in-person by a Wix representative, but we won't go into that) but I would still trust it over AI for anything other than static content.