Not quite - e.g. expandability of the Sheppard subway platforms/train length.
While true, LOL.........its worth noting here, the initial plans did not call for 'future proofing'; they called for full-length platforms and stations. We got what we got, because budget cuts were ordered.
The decision was made to save money by not doing any fit and finish (tile, lighting, ceilings, signage, etc.) on roughly 1/3 of each platform.
So it was more accident of fate, err, Mike Harris, more than it was great foresight.