Tests are in a higher level language, much simpler than app code. But, they are NOT free!
A test which is wrong, or doesn't match business expectations, is worse than no test at all. With no test, you can tell you don't understand how the code works in some situations. With a wrong test, the bad info gets lost among the other tests.
One time as a DevOps person I tried to help the App Devs with their work. A test failed. But I didn't understand the feature nor code nor the test well enough to know which one to fix! I did NOT want to "just make it work", that would be much worse than doing nothing. So I did nothing and moved on. I was... very salty that an expert Dev like myself couldn't help a simple code/test problem, but that was the best value I could provide: do nothing, there's definitely a bug, I can't fix it.
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