Earlier quoted context omitted.
I'm discussing UI/UX, not the stack. The back button is... something else here.
Isn't responsiveness on input definitely a UX concern, and doubly so when it changes the feel of a common operation in a specific context?
The modern web designers and app builders clearly don't agree with me with their heavy websites that make the browser eat a gig or so of RAM and all have unnecesarily slow UI's.