My college Capstone project, Cyber Wars: Age of AI, that I wrote in C++ amounted to about 96,000+ lines of code.... putting all the project files together.
I think what the thread is about is that it takes a bit of ability to manipulate the source in a way that brings about the desired result.
And yes... adding Bloom is only a matter of adding the right subroutines to the right places, but would you have any clue how to go about adding dual-wield, iron sights, FPI variable system, timer based movement, FPI controlled camera system, water, water physics (on entities as well as player), alternate weapon firing modes, etc, etc, etc?
Those are some the things that take a bit more ability than adding a couple sub routines to the source and putting in a call to them.
The one and only,
Whosoever says, "Don't sweat the small stuff," is obviously not a programmer.