For me personally, not usually. But having worked on a few different companies with embeddable widgets, yes it is. The page-based (SSG) routing is not an option

For me personally, not usually. But having worked on a few different companies with embeddable widgets, yes it is. The page-based (SSG) routing is not an option there. And even in CRUDs the product folks want WYSIWYG and smooth uploads of assets. With more and more bling it's just inevitable that one will need a JS framework eventually.