Not to detract anything from Neukirchen's and Karp's perfectly laudable efforts and achievements but the Woz/Jobs comparisons (including those in Marco Arment's recent blog post) are facile and specious.

Woz's design was strikingly cheaper and more capable than anything else on the market and then it was successfully marketed as the first personal computer with wide consumer adoption.

In the seven years it's taken Tumblr to exit by acquisition Apple:

Developed and launched the first popular consumer personal computer.

Developed and launched the first popular consumer personal computer with a GUI.

Became highly profitable

Offered the biggest IPO in decades

It's not the same ballpark or game.