I like the mantra: "prefer duplication over the wrong abstraction".

Combined with another interesting idea "whatever I dislike is wrong", it makes me _always be right_, which is awesome. I can never lose a discussion about abstraction with this powerful combo.

Code duplication is terrible in the age of LLMs, unless you want to maximize on drift.

prefer semantic abstraction even when it creates duplication

Just three words: rule of three.

Also, I prefer having all the code inside a single 5000-lines file than split up into many small files representing incorrect abstractions.

The urge to split the code up since they beginning is generally a bad idea; it forces early abstraction; more likely to be wrong.

Duplication and the wrong abstraction are looking more and more to be implimentation details handled by AI. A possible future may be a place where none of this matters.

Yes, but counterpoint - code duplication is also the wrong abstraction.

Pro tip - which is the least bad abstraction? Answer: it depends!

The sweet spot is really duplicating the wrong abstraction: I see you Claude!

These are not mutually exclusive.