this is true in theory but not in practice. just read the article, they came up to the same conclusion. if you want to offer a slick UX (a key element to convince users to pay these days) htmx won't cut it.
Fast is underrated these days and the experience of a fast site TTFB, FCP etc then being more bare metal and eschewing frameworks is wise. Ditching NextJS for Django allowed me to heavily speed up a site. You can do tricks to get React to be fast but that is more work.
Fast impresses people. Too many sites are janky and slow.