True, Tunneling is very costly, and there are several alternatives. but several proposals in the works already have tunnels.
But regarding the parking issues, which I would like to focus on, a parking Lot or Garage near Jack Block Park Transit Center, would relive parking problems all along Harbor ave, from Salty’s to the boat launch. For comparison, if there were a station at Avalon Street and 35th. SW, there is nowhere to park. Same goes for Fauntleroy and the Junction. The Stations there would create worst parking problems.
Light Rail Riders would need to take regular busses to these locations and transfer to downtown light rail. Those stations are designed for our expanding Condominium dwellers. Not home owners in West Seattle.