So I'm gathering that the question is, "should there be suburbs with urban town centers on commuter rail corridors surrounded by detached SFHs on large lots"? If so, I'd answer no. Urban town centers on commuter rail lines are good, but I don't find SFHs on large lots (in an urban/suburban setting) to be attractive from any perspective whether it be efficiency, lifestyle or aesthetics. They'd be attractive in a rural area, but I expect suburban to still be urban but just at a lower intensity. I'd consider the ultimate suburban format to be something like these:
(Halifax)
https://goo.gl/maps/eYF3gw44Lzs
https://goo.gl/maps/q8Z22bhjKDR2
https://goo.gl/maps/8J3HKVLSGT72
https://goo.gl/maps/5WSh132httN2
(Scarborough)
https://goo.gl/maps/CKxahPVYdK82
The architecture isn't any less bland than the average suburb but i'm referring more to the layout, massing, street interface, etc. Orderly, quiet, green, leafy, etc. but doesn't feel empty and isolated like many large lot areas.