I have a friend who was a project manager. He took the time to learn every platform used by his team, but held no pretenses that he could actually develop anything without the team. His main goal was filter all the horseshit from the stakeholders and higher-ups so that they wouldn't overwhelm the team with minutia. By learning the platforms and observing the team developing, he could make accurate predictions on timeliness based on whatever arbitrary feature was being requested and he'd always answer "let me ask my team" before discussing deliverables if he wasn't sure.

The number of times that he explained in meetings that's the team's timeline didn't change, but that the stakeholders' expectations did and that introduced a new additional timeline was incredible. It's unsurprising that he only lasted a year or two before his bosses started pushing for a promotion. Seeing him work made mean bit jealous that I couldn't be on his team, but we work at different companies and I don't want to join the private sector if I can be of benefit to public education.