IMO the problem for developers is that they have to provide general solutions, so they have to cover each case all the time instead of just a singular case at a time.

Obligatory video when it comes to time zones: https://www.youtube.com/watch?v=-5wpm-gesOY

constantly rewrite both the code and tests as you better understand how you’re going to solve the task while trying

The tests should be decoupled from the “how” though. It’s obviously not possible to completely decouple them, but if you’re “constantly” rewriting, something is going wrong.

Brilliant talk on that topic (with slight audio problems): https://www.youtube.com/watch?v=EZ05e7EMOLM