What grinds my gears is failing to solve problems I’ve already solved. At some point you have to convince others that a plan is good. Your arguments might not work on a new team. You might not know what the secret sauce was that got you consensus last time. Or after years of getting your way you may forget some of the arguments for an idea.
Because mastery is, at the end of the day, converting an intellectual process into intuition, so you can go faster. Once a decision process is successfully ingrained, the intellectualized path is dead weight.
There’s a lot of vaguely intellectually lazy, cheap instead of frugal thinking, and ethically challenged people in or around our industry, and the collective weight of it causes pushback on progress.