From RFC 2804:
- The IETF believes that adding a requirement for wiretapping will make affected protocol designs considerably more complex. Experience has shown that complexity almost inevitably jeopardizes the security of communications even when it is not being tapped by any legal means; there are also obvious risks raised by having to protect the access to the wiretap. This is in conflict with the goal of freedom from security loopholes.
https://datatracker.ietf.org/doc/rfc2804/
This was written in 2000 in response to US government requests to add backdoors to voice-over-IP (VoIP) standards.
It was recognized 25 years ago that having tapping capabilities is fundamentally insecure.