Exactly. That's the sign of a good leader. I'm retired now but when I was a cop we would always critique each other on tactics when we conducted high risk investigations. After every single search warrant I ever did we always got the entry team together after and used corrective criticism of each other to make sure we were safer.
On a similar subject if you want a good book to read about leadership try "Its your ship" written by a Navy Captain. It was required reading in LE in my area for supervisors.
For those looking to make the jump to leadership here is my book list that I recommend:
"As captain, I kept asking why we had no time for training. I was told because painting the ship took up a huge amount of time. So I asked 'Why do we need to paint the ship?'. I was told because the bolts used on the hull are not stainless so they rust and the ship looks bad so we paint it. 'Can't we use stainless bolts?' I asked. 'No', I was told because the Navy stores didn't have stainless bolts. So I gave my credit card to the supply officer and told him to go buy some stainless bolts. Hundreds of hours saved and now available for training."
EVERY SINGLE PROJECT I have ever worked on could apply this story and I would bet that there are similar examples of this on the MTA. The "speed team" from the article here is a perfect example of how sometimes lots of small fixes in the same direction can have enormous impacts.