Comment by Deganta

The problem is that C++ is full of so called "zero-cost-abstractions" that are only zero cost if you ignore:

1. Compile time

2. Non-optimized builds

Stuffing everything into the Standard Library using lots of template magic does has its upside, but debug performance is one of the big downsides.

Another one are really clunky interfaces, like std::variant. This should really have been a language feature, not a library features.