In case you missed the links in the article, you can also read the original research https://www.usenix.org/system/files/conference/soups2016/sou..., section 7.2 and confirm the premise of the article's title for yourself.
I use a DV cert on my personal site. CertSimple happily directs customers to LE, Heroku, AWS Cert Manager, CloudFlare and other places where you can get a cheap / free or shared DV cert for customers who just want people to encrypt data they send to their site and don't need to prove who they are.
Reasons you might want to prove who you are:
- You're handling sensitive data and want to prove there's a real company behind the site, rather than just someone who registered a domain.
- You have other people pretending to be you and want to distinguish your site from theirs.
- You have affiliates selling your product and want to show you're actually the real site.
- You're a crypto nerd and the idea of connecting to random public keys makes you boak.