You're right! Technology should under no circumstances by adopted blindly. Costs and opportunities should always be weighed carefully. Given that TLS is mentio

You're right! Technology should under no circumstances by adopted blindly. Costs and opportunities should always be weighed carefully. Given that TLS is mention in-line as also breaking this point, I think it perhaps possible that some readers might be of the opinion that the decision-making process you call for has already been conducted. Since TLS breaks the standard of "it is human-eyeball-friendly with telnet/netcat", HTTP/2 is little different in the minds of many. Your caution is right and apt. The history of computing is littered with technologies that were unready, unsuitable, or otherwise not fit for purpose when adopted.