The LA system is absolutely how it should work. That's the standard "open system". (The alternative, the standard "closed system", is to do it like the NYC Subway, with turnstiles everywhere, and that's not going to happen because nobody will do it at the rural stations.)
Hopefully fools like HAL will have no influence on Amtrak's future planning in this regard.
And HAL?
- Chicago cannot be configured with real gate lines without the cooperation of Metra (you can already bypass the idiocy if you're clever), particularly the platform which leads to the Ogilvie exit
- NY Penn cannot be configured with real gate lines without the cooperation of LIRR and NJT (you can already bypass the idiocy if you're clever, and people often do)
- DC cannot be configured with real gate lines without the cooperation of MARC and VRE
- Boston cannot be configured with real gate lines without the cooperation of the MBTA
The LA Metro Red and Purple lines switched to a gate system a year or more ago IIRC.
As for NYP, Amtrak would only need to install gates at the current Amtrak boarding area and the expanded West End concourse (which is the future boarding area for Moynihan station). Amtrak puts the gate dragons only at their entrances, so why would they have to install gate scanners at the NJT and LIRR platform entrances? When the gate on the West End Concourse is being used for boarding a LIRR train, the gate can be left open or the scanners ignored. Same goes for VRE or MARC at WAS. Don't use the scanners or have a gate dragon when boarding the MARC and VRE trains.
I think we underestimate here the need for crowd control and the number of passengers who might get on the wrong Amtrak train or without a ticket if there was not a ticket check. Especially at the crowded and confusing NYP. I have seen this when a woman got on at Trenton and sat next to me while I was a Regional headed to NYP. The conductor showed up only a couple of minutes later and she pulled out a NJT ticket. Apparently she was confused and did not realize that this was not a NJT train despite the numerous Amtrak logos. The Conductor was rather brusque with her and ordered her to go to the cafe car where she would have to get off at the next stop, which IIRC, was Metropark. She looked confused, but got up and walked in the direction of the cafe car. I suspect this is a common occurrence for the ticket takers on the NEC.
If someone gets on an southbound Amtrak train at NYP with the wrong ticket or a train heading in the wrong direction, their ticket may not get checked until after Newark. The next stop might be Trenton, so they could get stuck in Trenton while straightening out their trip. If someone gets on the wrong commuter train, usually it not far to the next stop and the passenger can get off and figure out how to get to where they were originally going. There is also the possibility of someone doing this intentionally, buying a NJT, SEPTA ticket and getting on an Acela or Regional, claiming ignorance when the conductor comes to scan the ticket, so they can get a more comfortable and faster ride to the next Amtrak stop.
It is not cost effective to check tickets at the gate at all the NEC stations. But since NYP, WAS, PHL, BOS have such a high volume and a lot of station staff, they can reduce the number of passengers getting on the wrong train or without a ticket by checking at those stations.
Now Amtrak can certainly improve the boarding process at NYP, WAS, PHL. Especially at NYP, with working displays at the gate, a scanner on each side to get people through more quickly and allow boarding from 2 locations once the expanded West End Concourse opens.