It's a cost-benefit situation, that interchange was $100 million in 2009 and they built flyovers to service the heavy left turning movements. Full stack interchanges are monstrosities and that's why there's only one in the entire country, in Toronto.
If it needs a fix later on then so be it, but I'm perfectly fine with the way it was built 10+ years ago when a flyover was absolutely not necessary.
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