I understand the OP’s ‘lowest common denominator’ comment to mean all good but unique features can’t be included in the abstraction. For example, only Google ha

I understand the OP’s ‘lowest common denominator’ comment to mean all good but unique features can’t be included in the abstraction. For example, only Google has Streetview or anything like it, so you can’t abstract it. As a result, you end up not using the abstraction for the most part.