But then you could write a blog post about pretty much every API misuse ever, which doesn't really seem very constructive to me.

But okay, maybe it's more obvious when having worked with pre-C++11 code, where you would have killed for something like emplace_back. If you are new to the language and only know modern C++, you probably don't think much about why emplace_back exists in addition to push_back, and why it can be faster.