I mostly agree, but not entirely. The problem is that things that are lined up look nice from far away, and very close up, but not always when reading text.

The Apple "Manage" button is the simplest to illustrate. You might think that just having equal vertical space above the M and below the g is the best, but when you read text you're also used to seeing letters stick out of the bottom of the line. So having the g not protrude might look odd.

Or if you have two buttons next to each other, one "Manage" and one "Add" - what should you do? Should you centre Manage, and put the text for both on the same imaginary horizontal line? That will make "Add" look odd when viewed in isolation.

Or should you centre Add? Then Manage will look odd when screenshotted by itself.

Or should you let each have their own vertical centre? Then they will be mismatched.

What to do?