Many of these examples use Next.js to support their static content (eg, marketing). Maybe they mean that it's overkill for smaller projects or customers (eg, SMEs) which I would tend to agree with (although, there are Next.js low-code/CMS services emerging, like Builder.io or Plasmic) but for larger companies that have the JS web dev talent it can make perfect sense to do their marketing sites on Next.js. I've also served a small business (an agency) that wanted to do very funky stuff for their marketing site - Webflow or Wordpress certainly weren't going to cut it, so Next was a good fit.