It's really frustrating how Metrolinx is constructing every transit line to different parameters & specifications. Even different voltage setups for the electrical systems for both the Finch and Eglinton LRT lines.
Well, hold on here.
First off, it was the TTC, not Metrolinx that created the standards for the LRT lines.
And the LRT lines are being standardized - just not to a standard seen before in Toronto. 750V dc, standard gauge, 25m curves and 8.8m wide cars is a standard used all around the world, with cars produced by a multitude of vendors. And in that case, that's fine as there was going to be maybe only one place where they could have interfaced with the legacy streetcar fleet - at Jane and St. Clair. They didn't need to be interoperable with the legacy Toronto system, they only needed to be interoperable with themselves - and by and large, they will be. (Yes, the signal systems will be different, but at the end of the day that's a far less big deal than the others.)
Why does Metrolinx appear to see no value in any kind of standardization/ interoperability among Toronto's transit line?
It's easy to do so when you have no capability for corporate history. Or worse yet, you're fresh out of university and haven't yet had the experience to see why things are done in the way they are. Both of these are the case at Metrolinx.
"It's always been done that way" can be a failing. But in many cases it's also because it was found a long time ago to be the best way to do things considering the circumstances.
The lack of interoperability among Toronto's newest transit lines is going to be expensive in the long run.
Within reason, yes. If all of the LRTs were the same type and manufacturer then they'd all use the same parts, and so the fact that they were spread around to two or three different places wouldn't be such a big deal. And the sheer number of vehicles required for the Ontario Line will mean that no matter what it was always going to require it's own facilities and tools and techniques that would rival Greenwood or Wilson.
Dan