Another is that once the context window resets, it often loses the information it was working from. If you want a long term maintainer for your code base, it’s better to train up junior engineers so that they one day would become experts on the code base that you or your business is reliant on. But the economy does not usually care about the distant future as much as the now.
Strewth*
*Australian for ain't that the truth (literally 'God's truth')