Whats your opinion on Linters, Testers, and Prettiers?

Ive been working on a project recently and a bunch of people suggested that I should start using a testing system. This testing system was working for a while but then someone else suggested that I should start using a linter. The linter ended up breaking all of my testing code, and before long I had spend nearly three hours getting them working together.

Here was the project if you want to check it out

After that, I was told that the code was inconsistently formatted, so I needed to add a prettier system. All of my engineers are now telling me that they have lost countless man-hours battling against this new integration system.

So, Im getting rid of it. My entire linter system, code grading, beautifier, etc. is gone. And, Im replacing it with my own solution- if you want something done right, you have to do it yourself.

I want to hear what struggles you have had with your systems to boost efficiency, or if you think I am completely wrong and should shut up.