Unit tests make debugging suck a bit lest, because of the ability to change the test case (on local machine only!) / and tested code iteratively in combination

Unit tests make debugging suck a bit lest, because of the ability to change the test case (on local machine only!) / and tested code iteratively in combination with the debugger to find the source of the problem, with fast feedback cycle. Debugging using the UI is another tool. Advantage is you can quickly cover new scenarios and change what you do based on new info. Downside is loading time can be a lot longer than running a unit test.