Obviously, yes.
> I haven't seen anything like that. 99.9% of applications I interact with are just simple CRUD apps.
Irrelevant. Being CRUD is completely orthogonal to whether the WebApps are interactive or not.
Look at Gmail. You can hand wave over it and claim it's a CRUD app. However, no one in their right mind would try to deny the app is a "highly interactive, component-based, state-driven, design-system-heavy applications".
Also, it's silly to pretend that SPA-type apps are only justified if you check each box in the buzzword bingo card. One of the primary selling points of designing SPA or non-static lage, SPA-like WebApps is performance. Meaning, you are able to put together a highly performant web page if you do not require full page reloads each time anyone clicks on something, if you can easily implement optimistic logic in components, and if you can update only a subset of components when you receive a response from a request.
I recommend discovering the concept of perceived performance and afterwards you read through common patterns and strategies to optimize perceived performance. After you do that, go through a though experiment where you start off with an old timey dynamic HTML/server-side rendered WebApp and consider the challenge of achieving the same type of improvements in user experience, or even doing the same tricks. You'll quickly arrive at the same conclusions at the whole world around you already arrived at.