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Reasoning seems to be "I can't imagine why this would be useful and I don't trust the people I work with who might use this". Not exactly solid logic there, champ. And for the examples (matrices, database records), I'd expect that when the operation couldn't apply, that the operation would -- wait for it -- throw an exception, or return some variation of NaN.

Also, "Considered Harmful" is no longer clever.

It *is* harmful in that it obfuscates the intent of the code.

What does

Customer c1 = getCustomer();
Customer c2 = getCustomer();

Customer c3 = c1 + c2;

mean?

Are you dense? You don't have to apply operator overloading to every situation. What would it ever mean to "add two customers"? If it doesn't make sense conceptually, why would you expect it to make sense practically?