Not sure about stats but if you hang out in networking forums, you'll see netops...

Karrot_Kream on Oct 5, 2023 | parent | context | favorite | on: HTTP/3 adoption is growing rapidly

Not sure about stats but if you hang out in networking forums, you'll see netops complaining about bad implementations of protocols in their networking gear forever. This has been a huge problem in several protocols, everything from SCTP to IPSec to UDP RTSP.