At the end of the day the Innovia ART design is still based on the original
Intermediate Capacity Transit System. The particular style that the SkyTrain uses has always been designed on the assumption that passengers won't be on the train for long periods (Metrotown to Waterfront for example) but when you start separating stations by 10km+ the need for sitting space outweighs the need for standing space. Consider how much on the West Coast Express is standing only. The Mk II's are also too narrow for better seating arrangements, plus they still have various electronics nested away under the central seating. They're just not designed for a system being proposed to serve the valley unless you are running a LOT of trains to keep up with demand and you simply could not allow them into the Expo Line past Scott Road or you're going to overburden the original stretch from Columbia and Waterfront.
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It would be even better cranked up to ~100 km/h on longer straight section like what we'd see if it ran out to the valley.
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Mk I's apparently had their speeds reduced on straight stretches in the late 80's due to excessive cabin wobble. I'm not sure if the later trains rectified this issue.