The MTA also has far more stations than any other US system, indeed more than any other metro system on Earth.
The NYC subway has 424 stations. The next highest in the US is the L in Chicago, with 146, followed by DC, with 98.
Seems natural it would take longer, though that is scant comfort to the people who need them. NYC has 133 accessible stations, which is 91% of the L’s total station count.