The perception hasn’t appeared from nowhere. A lot of newer website platforms have been built, positioned or marketed around a different audience to traditional content management systems.
Platforms such as Webflow and Framer have made it possible for designers to take much more control of the website-building process themselves. Instead of designing something in Figma and handing it over to a developer to reproduce, visual development tools allow much more of that work to continue through to the finished website.
Naturally, platforms aimed at designers put a lot of emphasis on visual control, interactions and animation. They’ve attracted communities of designers who produce some excellent work, and that work then becomes part of how the platforms themselves are perceived.
Other modern CMS platforms take different approaches. Sanity, for example, separates structured content from the front end, giving developers considerable freedom over how and where that content is presented. Craft is similarly flexible in how developers model content and build the presentation layer.
These are genuinely different approaches to building and managing websites, and there can be good reasons to choose any of them. What doesn’t follow is that their front ends are inherently capable of looking better than a website using WordPress or another CMS.
Making a particular type of front-end development easier or more accessible isn’t the same as making it exclusively possible on that platform.