Great question — answering as the UphillTech team:
CUEs use's 11 speed cassettes spacing, 11 speed chains and has a pull ratio of 1.05/1.1 (depending on what web site you read). As you noted, it is incompatible with your Alivio. The marketing blurb claims the overall goal is to increase compatibility amoung components by creating consistency across the range... (Rolls eyes and ques the mandatory https://xkcd.com/927/ ). Those of us that have been around a while are not holding our breath. You cannot backport compatibility by coming up with a new standard, all you can hope to do is retain the standard for long enough the incompatible components dies out - not happening soon given bikes can last decades. With the different cable pull (Alivio...
Full answer by mattnz: https://bicycles.stackexchange.com/a/97064 (CC BY-SA 4.0).
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