Since this is about language and similes, what about "You can't compare apples and oranges"? People say that frequently, but why in particular is that so? I think you can compare any one thing to any other one thing. You can discuss what are their common features and what features they have that are not shared. So it seems to me "Can't compare apples and oranges" is often used just as a polemic device, trying to atta…
It seems to me that "can't compare apples and oranges" is trying to say that you're using apple criteria to try to judge oranges. It's not that you can't compare apples and oranges, but you have to use fruit criteria to do so, not apple criteria or orange criteria. So, to stop using similes: You can compare CPUs. You can compare memory chips. You can also compare memory chips and CPUs on, say, power consumption. But…
But apples and oranges are both good food, so we can compare how much calories you get forjm them, or vitamins etc.