I instantly have problem with anyone touting the opportunity costs related to an entirely made up number. 10 minutes off a fictional commute is not a convincing

I instantly have problem with anyone touting the opportunity costs related to an entirely made up number. 10 minutes off a fictional commute is not a convincing metric. How about instead we have say, line X needs $Y for modernizations after which line X will be Z minutes faster along its route. Or, which arterials will have new transit solutions. I'm not arguing this is a bad spend of money (quite the opposite) but this article badly needs some real numbers to make its point.