Yes, you're 100% in it being cheap.
I think I should have been more clear, it was cheap to build, but now look at it. Not just from it needing to be repaired, but peopels time is wasted, more busses need drivers and diesel fuel, how many man hours were spent investigating the solution, testing, and implementing. There's many downstream effects of it being cheaper initially that can be hard to see or measure.
But yes, it was cheap to build, especially the eastern extension which is a good thing, transit projects in NA are WAY too expensive.