Adobe Audience Library works, for most cases, as a valid substitute for tool-centric segment creation, such as directly in AAM or in Adobe Analytics. It helps a lot sharing segments within the experience cloud. However, we've found lately that the criteria for the creation of these audiences is quite limited.
Many processing variables, such as "Mobile Device" and "Time spent on page" aren't available on the Adobe Audience Library. This becomes a problem once one has surpassed the limit of 75 segments to share between Adobe Analytics and the Experience Cloud as a whole, since we can't grasp these variables elsewhere.
I would really like to request a feature in which this kind of variables are available in Adobe Audience Library, so that we can actually experience the integration of the Adobe Suite to its fullest.