Thanks for your post.
For me, the coverage is almost related to the "how often i will update this code in the futur"
For me this is the key metric to know if I need reasonable test coverage on this part of code or I can test manually once and have a weak coverage.
Also, if you have some code in your project and used by 1% of your customers, you should pay to it as much attention to the rest.
If the code exist it's important, otherwise remove it
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