I don't think it has anything to do with ideology.
First, VMC isn't open yet. Maybe there will be more bashing when it is.
Second, Sheppard was a compromised line and would be different if what was planned was built. (Or are you talking about the LRT now going forward, finally, probably on Sheppard? Either way, it's a mess).
Third, Scarborough had a very public and tumultuous (and embarrassing) "planning" process, championed by Rob Ford.
Fourth, you could even add SmartTrack to the list and wonder why TYSSE didn't get the same scrutiny.
One ironic way of looking at it: TYSSE has the least controversy because it's the one Toronto council had the least to do with.
Makes you think
Either way, Wilson was never a natural terminus and neither was Downsview. They could/should have gone to York years ago. The shifting market and provincial policy and political reality made going the few extra KM north a necessity. It's really that simple. The Scarborough line can't be explained with narrative even half as succinct or comprehensible.
Well, I wrote above that I have mixed feelings about what the hospital and/or city hall would have brought to VMC; is CITY HALL a major trip generator? Mmmm, I doubt it. It's symbolic; though symbolism of not putting it in VMC is fair game.
But it's not just a matter of policy, it's ultimately the market. If people want condos near the subway, VMC will do fine, no matter how stupid Vaughan acts.
No point going over this old track (so to speak) again,but I think it barely even qualifies as a "suburban subway project." Yonge north of Steeles is no more suburban than Yonge and York Mills or, heck, Yonge and Rosedale. It's only in the past few years that Yonge-Sheppard has really come into its own. If I was a betting man, I'd bet on Yonge/7 development ahead of Jane/7 or Warden/7 development, and both of those are coming along, albeit at their own paces.
Again, the market: If you're a developer and I tell you I can get 20 acres at Yonge/7, Jane/7, Warden/7 or Pine Valley and Major Mack, which do you take?
I see what you're saying, at a general level, I just think you overthink it. I could argue (and many have) that the (lack of) intensification along most of the Danforth shows that subways can't do it on their own. Of course they can't. you need jobs - and Vaughan (and indeed, much of Highway 7) has that. And you need the right policies and the right market. I think all those things, generally, are more transit-oriented in York Region now than they were in Toronto when the B-D line was built.
you can't create the future, but you can do your best to put the right pieces in place to make it happen.
(And it's rather early to be mulling shuttering lines to fund the TYSSE. As it is, they're going to be turning trains around so why don't we give it a chance instead of, as with Sheppard, strangling it in the crib.) I may be naive in my optimism, but it's better than hammering away at things you can't change.