I wonder if the unstated issue here is: C++ is so complex that it's hard to think through all the implications of design proposals like this. So practically s

I wonder if the unstated issue here is: C++ is so complex that it's hard to think through all the implications of design proposals like this. So practically speaking, the only way to prove a design change is to implement it and get lots of people to take it for a test drive. But it's hard to find enough people willing to do that in earnest, so the only real way to test the idea is to make it part of the language standard.