[aplanas]

I think that this is a fair argument. When the mental model is already there, changing it is difficult and the trade-offs needs to be in a very advantage position to justify the change.

But over the time this argument loose fairness in some direction. Today, in 2020, I would feel awful if in my meetings I argued that creating unit tests is meaningless, as this will point bugs in my code that I need to fight with. Or that QA is a bunch of mean people that do not understand how to use my library and only want to point to "bugs" that is more work to me to "fix".

IMHO the borrow checker _is_ this test that I do not want to write, or this QA engineer that exercise the code to find a corner case when I am causing a memory corruption in my not-perfect work.