Because we have evidence otherwise, and even the worst code can be refactored by LLMs.

That a high velocity project might accumulate technical debt isn't interesting to me if LLMs can also pay it back or if you can decide to work at a different pace where you polish the architecture as you go instead of accumulating debt.

I'd make the opposite claim to you: people really don't want my claims to be true, probably because it robs us of our value and expertise as software engineers. But it's getting a bit late in the game to still be dancing around that pill to swallow.