I'll say it again: The wear and tear implemented with engineer mode is on the same level as having to drink every 5 minutes in a survival game... IT'S NOT FUN. Realistically speaking, it's incredibly stupid: my car engine isn't going to spontaneously combust just because I drove for an hour without fixing it. Gameplay-wise, it's just one more headache to deal with in an ocean of problems. The engineering mode doesn't need this mechanism; it's self-sufficient. No component should show visible wear during normal use.