Good questions.

> why did it write so much to begin with?

It's an incremental project covering a complex domain. At any time, the code has to stay balanced in a spot that addresses correctness and performance across things like pty parsing, a terminal grid, stateful pty behavior, rendering, scrollback history, font glyphs, and like all software there is a fractal of idiosyncrasies that sprout up. And that's just the terminal side.

Unless you can see the future, like most software, so much of the project is trying things and seeing what happens at the periphery, like how to represent "row damage" and apply it in a way that works with macOS Core Graphics and 1000 other things.

e.g. Can you tell me off the top of your head what the trade-offs are of representing the terminal contents/scrollback as a pre-wrapped grid vs. a list of logical lines that are soft-wrapped on the fly? Did you enumerate them all and correctly weigh them such that you can pick the ideal solution ahead of time? No. You just kinda make educated decisions and find out in practice what the exact weight of the trade-offs are.

You should see the amount of iterations a human needs on these kinds of projects. https://github.com/ghostty-org/ghostty has almost 18,000 commits. So does https://github.com/gnachman/iterm2. So does https://github.com/kovidgoyal/kitty.

> why do you assume that now there's no more debt?

I don't. Like all software, you try to ratchet into better and better positions, and you try to come up with metrics that can tell you "You are here" with regard to rather fuzzy goals like "it should be correct and performant and nice to use".

But I can look at individual findings and their solution to go "yes, this improves the code." And on principle I think that, e.g. correct/DRY/simple by-construction is superior to by-convention, and I assume it helps future agents reason about the system and make future edits, and it gives them singular places to make changes that impact multiple components just like it would a human. But how much did it actually matter?