I come from a different environment (Kettler World Tours)
This software shows the route via Bing Maps and I’m used to check the Altitude Overview (which can be zoomed) or the big currenty ascend/descend percentage.
That means that I see the same behavior as you BUT …
I’m used to check the metrics and I do NOT rely on the visual image to get the feeling of current ascending/percentage.
My solution would be (as I never experienced realistic visual display) to make the metrics better visible.
This might explain why some users describe the problem as missing (or to small) display of metrics and other users describe the problem as visual problem (that it is not possible from the UI to get a good feeling of the route.
From what I read most/all users had the same feeling like you