You can have a densely populated neighborhood where it's a nice walk to the train station past convenient shops and stuff or you can have a parking crater surrounded by multilane traffic but you can't have both.

Attleboro has more like 300. The Verizon lot and beyond are all commercial properties.

Also it's designed to serve the pawtucket/centrallfalls/Blackstone valley communities which is small. They're also making it a ripta hub so you should see some better bus routes in the area providing easier/better access. I'm sure they did some surveying and determined that they didn't need to provide much parking.