In application development, you seldom have the need for maximum speed in all your coding. And always worrying about such things as what is addressed by this small enhancement, is a pain.
In most scripting languages, such details are just falling away.
I still program in C/C++ -- but just for very speed-intensive "hot-spot" functions, in form of Python enhancement modules. And in those, I have the time and patience to look for all these implementation details. All the rest, I do in Python.