The "problem" is that they seem to have this idyllic vision of riding the GO, where people can take the time to tap wherever they want. That maybe true for off-peak periods or other stations - Union isn't that duck - good luck if your train is leaving in a few minutes and you have to find a clear Presto terminal - and there is a zillion people in front of you (some of whom will insist that that tapping multiple times will turn a red into a green; or that it will read their card buried in the inner sanctum of their MK on the 11th try). They will however let us know they have customer service ambassadors and that stupidly grating AI announcement though.
Amsterdam has by far the best «I'm in a hurry» process at Centraal. They ring the entire area with fare-gates with the tap pads functional but the doors removed. Anybody can enter or leave; but those tapping will find it both very easy to do and it's very clear that you should be doing so (impossible to forget).