It's certainly a great and useful tool. But it's a website maker somewhat in the same way that a Facebook page or Instagram account is a website maker.

AFAIK you can't make a website on SquareSpace and download it to your computer, edit it locally and move it to a different host, etc.

In the past there were actual WYSIWYG editors which let you design your website or CMS theme and then do whatever you wished with it. Artisteer was the pinnacle of this. Then nerds took over with their command lines and Kubernetes.

Imagine if one day people decided that making and editing documents in Word was no longer possible, that they had to be hand coded and command line compiled and linted, and not mix tabs and spaces. That's what happened to website publishing. For no reason at all.