All through this you are engaging in a false dichotomy that assumes that having to make a transfer at Kennedy implies a lack of "connection". This similarly assumes that most people in Scarborough are single-mindedly headed downtown, even though it's been repeatedly shown that intra-Scarborough travel is predominant. There's nothing particularly special about STC and the nearby Civic Centre compared to elsewhere in Scarborough; North York's initial "downtown" development mostly occurred prior to amalgamation, so it is not really comparable.
Simply put, there is no "ideology" here. It is singularly wasteful to blow billions on a single stop when you can serve far more people in a far larger network with LRT technology. My point about Calgary is that there LRT serves an even more dispersed population, but with reasonable service (q5-10min) and through a downtown that is more developed and economically intense than STC will ever, ever be. They also manage to have a free fare zone throughout downtown.
And, really, the argument that it's somehow definitive that LRT lacks sufficient capacity is entirely specious and poorly substantiated. Given that much of Scarborough is actually quite a bit farther in distance from downtown than, for example, North York, it begs asking why better zoned fares of GO RER are not a more appropriate place to fund to ensure quick transit downtown. After all, if everyone is just interested in a one-seat ride downtown (provided they consider downtown exclusively to exist along Bloor St), why not just venture to one of Scarborough's several GO stations once RER is implemented?