The train tracks being down the middle of the highway makes a lot of sense, you are keeping the noise away from housing and it's an effective use of space since nothing else really works there, plus you already have the right of way.
Might make sense for the station to be off to whichever side has more people, and the tracks to go under the highway briefly but I bet that adds a bunch of cost.
Sure but the opportunity cost of not paying extra to place your train tracks well? No one rides it. The health cost of allcof this noise pollution on riders encourages them to find other transportstion options. No destination at the end. You get off the train and there's no development because it's surrounded by loud, ugly highway.
They do kind of suck. But from a city planner perspective you already have the right of way for all that road. Makes sense to put the transit station in the middle of the right of way.
Maybe add airport style moving walkways for the highway transit centers to increase the catchment area. Imagine if you could go 500 m on a moving walkway from transit stop away from the highway into the urban area
They also don't have to entirely be terrible places to be.
Just look at Amsterdam-Zuid Station as an example of how to make such a highway median station bearable.
Though it is worth noting that Amsterdam-Zuid will be redeveloped in the coming years to move the highways underground
Why stop there? Why not build a hospital suspended in the most human-hostile area of land in the entire fucking city? A library? A day care? All that wasted land!