Chicken and egg. Can't change the culture if you don't change the product.
For example:
Not all stations have that capability. And spotting trains is at the discretion of the Conductor and Engineer. It may not be the same every time.
Why not? Can't a placard be placed along the track showing where to spot the train? Most trains in Japan are operated manually, and probably 1/2 the US light rail systems are that way. Engineers stop within inches every day of where they are supposed to.
I can't speak for Japan, but light rail vehicles typically have fixed consists. Amtrak (and various railroads around the country) not only vary in make up, they can vary in length due to equipment utilized They started shying away from fixed, timetable identified station markers for that very reason. They become fixed signals (by rule) and are not easily overridden. That perfect spot from yesterday may be a disaster today since the train is operating backwards. Having a spot for a certain part of the train to remain on the platform may not work when you have a train like the Lake Shore, which will operate with two of the new diners deadheading in the consist, may have an additional engine (or two) or the cafe car is not the forth car.
Since operations vary (is there an interlocking at the end of this station or is the whole platform in service,) they allow for flexibility.
Furthermore, I'm guessing Twropr hasn't been on the NEC portion of the Meteor since the 60's. Otherwise, he'd know that they do have general location signs for the trains(ex: coaches board locations c-f, sleepers a-b) and fixed locations (that notify which end has the club car and first class car vs coach) for the one train that has a fixed consist. They are used as guidelines since as previously mentioned, the sleepers may be on the rear end (ex -e-f and coaches are now a-d.)
They also have station personnel on the platform to direct and assist loading. However, if you have 5 wheelchair passengers at one stop (which was was the case with the 12 minute delay at PHL that led to the loss of slot), it will take time to ramp them on and assist each of them to their seat.