Keep in mind that the C++ committee is made of up a group of volunteers and is an entirely non-profit organization. Membership participation actually comes at a great personal cost of the individuals. When I see language like "failure to deliver" it makes me wonder if the committee process is being fairly perceived by the larger overall user-base.
As an aside, anyone can join the committee if they really wanted to see a particular language feature see the light of day in a certain way. It's not as hard as you might think. All it takes is a bit of hard work on any sufficiently motivated individual's part.
The language is just too complicated at this point. Any time you want to add something you need to ensure it plays well with everything else. It is a huge amount of friction.
As an aside, anyone can join the committee if they really wanted to see a particular language feature see the light of day in a certain way. It's not as hard as you might think. All it takes is a bit of hard work on any sufficiently motivated individual's part.
There's a great discussion of the process here: https://www.youtube.com/watch?v=PqU_ot4BlNQ