Earlier quoted context omitted.
I will probably get sniped by someone who actually knows what they're talking about (please correct me if I'm wrong :D), but my impression of the T issues is less a funding issue, and more a competency/corruption issue. We're building above-ground rail at underground rail prices for one example problem.
I toured a piece of property at the border of Charlestown and Somerville near a big T stop. There was an empty lot next to the tracks that was owned by the MBTA on paper. But de facto, the neighbor and was clearly using the entire massive lot as an extended back yard (they even had a garden shed and paved parking on the MBTA owned lot). Looked up the property records. Either a HIGHLY coincidental name clash, or there…
That lot was the lichmere stop of the green line until about two years ago. And was the lichmere stop for decades. Once torn down it was used as a gravel pile and support area for MBTA work. Recently that corner had the traffic pattern altered a bit with a new light and cross street.
You gotta remember, in America city infrastructure takes time.
Lot in question: https://maps.app.goo.gl/4HSueRhVb8TPZNoZ7