> I can
You can because, I guess, your project may have a small scope, few people working on it, no dependencies etc.
I cannot, because each line that I change has an effect in millions of other lines and hundreds of other people, and millions of users.
Different situation, different needs.
> each line that I change has an effect in millions of other lines
That sounds like an architectural problem.
Wise words. Exactly what I would except from a millenium-old elf :P