1. It's been talked about for much longer than that.

2. You don't really appreciate the issue. Signed integer overflow is undefined. If you check for that overflow after the fact the compiler can, and demonstrably has pretended that the overflow can't happen and optimised away your overflow check.

You may not even come across that failure mode to know to 'fix' it. And good luck finding the issue unless you know about UB and what the compiler can and will do in such situations.