I find that link pretty interesting but I still don't understand why you say that. I'm saying Google caring about design on Google Maps is the exception that proves the rule (the rule being that they don't care much about design).
There isn't a rule that "Google don't care about design" if there is an exception. Exceptions to rules disprove rules. However, an explicit exception to an unwritten rule suggests the existence of that rule - for example, a sign saying "Parking allowed between 9am and 5pm" would imply that there is a rule that parking is not allowed at any other time.