Complexity should serve reality, not decorate expertise.

Complexity is legitimate when the subject requires it. The problem is complexity used as a display, the extra framework, the specialized vocabulary, the elaborate model, all of which signal sophistication rather than doing work. That kind imposes a cost on everyone else so that one person can look capable. The test is whether removing it would change the outcome.

Ask of any complication whether it improves the result or the impression. Keep the first kind and cut the second. Expertise that has to be signaled is usually being overstated.