you are correct... they changed the presentation... but for me, I like it better that way...
the previous one was more "old school"... the new one is more modern.
also, I find it's now easier to navigate on mobile... you don't need to zoom in/out to see the information you need.
on mobile, the fastest way to check your usage is through the Espace Client app (not sure if the name is different in English).
you get the data usage for all your line (and home internet if you are with videotron on the first screen.
you can select your line to see more details.