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Ubuntu is most easily installed from USB stick already, so not sure why you would say that?

I said this somewhere else, but my Asus eee PC w/Ubuntu from 2008 does not have an optical drive and has an SSD. Apple's a little late to the game. Once again they do something that isn't new and the world thinks that it's innovative or earth-shattering.

You may want to check when the first generation of MacBook Air was released.

But even in the linux space I see people migrating from CDs. Just remember that diskless instant on small computers originally came with linux. My only problem with that is that it's much more easy to deal with isos than with imgs.