[quesera]

Sometimes those people are customers, and they matter a lot.

They're also not wrong. The aesthetic of a typeface is a complicated thing. You have history and precedent to consider, for example.

There are objectively incorrect choices, sometimes.

The irony here is that Arial has always been the substitute because the real thing wasn't available. (i.e. Microsoft didn't want to pay to license Helvetica, whereas Apple did).

So the reaction you're having to the idea of someone substituting the original for the replacement is a bit odd, I think. Maybe you're reacting to the idea of caring. You don't have to care what others care about.