MacWorld’s Jason Snell spoke with Phil Schiller, senior vice president of worldwide marketing, Bud Tribble, vice president of software technology, and Craig Federighi, senior vice president of software engineering, about the Mac’s thirty years of evolution.

Phil Schiller:

“Every company that made computers when we started the Mac, they’re all gone,” said Philip Schiller, Apple’s senior vice president of worldwide marketing, in an interview on Apple’s Cupertino campus Thursday. “We’re the only one left. We’re still doing it, and growing faster than the rest of the PC industry because of that willingness to reinvent ourselves over and over.”

Bud Tribble:

“An incredible amount of thought and creativity went into the original Mac metaphor,” Tribble said. “So there are some extremely strong threads of DNA that have lasted for 30 years. The sign of the strength of them and the underlying principles behind them—that the Mac should be easily approachable and learnable by just looking at it, that it should bend to the will of the person and not bend the person’s will to the technology—those underlying threads also apply to our other products.”

Craig Federighi:

“The reason OS X has a different interface than iOS isn’t because one came after the other or because this one’s old and this one’s new,” Federighi said. Instead, it’s because using a mouse and keyboard just isn’t the same as tapping with your finger. “This device,” Federighi said, pointing at a MacBook Air screen, “has been honed over 30 years to be optimal” for keyboards and mice. Schiller and Federighi both made clear that Apple believes that competitors who try to attach a touchscreen to a PC or a clamshell keyboard onto a tablet are barking up the wrong tree.

“To say [OS X and iOS] should be the same, independent of their purpose? Let’s just converge, for the sake of convergence? [It’s] absolutely a nongoal,” Federighi said. “You don’t want to say the Mac became less good at being a Mac because someone tried to turn it into iOS. At the same time, you don’t want to feel like iOS was designed by [one] company and Mac was designed by [a different] company, and they’re different for reasons of lack of common vision. We have a common sense of aesthetics, a common set of principles that drive us, and we’re building the best products we can for their unique purposes. So you’ll see them be the same where that makes sense, and you’ll see them be different in those things that are critical to their essence.”