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That’s the exact kind of thing experienced developers want to do.
They don’t always want to just write easy code again and again. That can get boring and tedious. They want to come into a project with difficult problems and take ownership of them and solve them.
I can see that but why not write it in a way that doesn’t insult your potential future coworkers and indirectly the people who hired them?
Because the audience is not his future co-workers, it’s the managers and hiring staff who have problems that they need solved and are aware of the existing limitations that they have within the team.