Very recently, I had the impression that fewer items were laid out for our enjoyment in the MLLs, especially in the morning, but was not sure...

Either the offerings are being changed or cut back (more likely).

It is a pity because MLLs really used to stand out above the competition in North America. It came to my attention in the Trip Reports section of Flyertalk that AA have 'flagship lounges' and from the pictures posted, they look rather appealing with quite a few items offered. Would it not make sense for AC to create their own 'flagship' or 'signature' lounges at least in YUL, YYZ and YVR?

As was always the case, and even more so now, Andrew's comments would help clarify what is going on. Andrew, would you please come forward? Thanks.