Those design decisions were never made in a vacuum. They relied on telemetry (or, less scarily, user testing, user feedback, user research, etc) to figure out what works best. As a reminder, our intuition doesn't come from nowhere, rather centuries of survival and expectations. If you do not know what these expectations are, and if you do not know how your users interact with your product based on these expectations, you cannot make a good product. Certainly, you can make a product that appeals only to you, but how many of yous exist?

The design of a teapot is a great one. It didn't magically appear with handles and a spout and a place to hold leaves, but after years of refining based on usage. As shocking as that is, tea wasn't even discovered on purpose, let alone having a specific vessel for it right out the gate.

So yes, telemetry is essential. Taste is personal.