Re: To sum up…
What comes after nirvana?
Well, technically, "nirvana" means "the cessation of turnings". The only time that a software or hardware product doesn't have any more "turnings" (which I guess would be an update cycle) is when it's end-of-lifed and not supported any more. Not quite "nirvana". I guess you could use the expression "ne plus ultra" instead, but really we all know that technology never arrives at perfection (since in fact, "all composite things decay") and comparisons or metaphors like this are just hyperbole.
Nirvana isn't the same as enlightenment (and you're not really asking what comes after), but you can get the flavour from this saying:
Before Enlightenment: Chop wood, carry water;
After Enlightenment: Chop wood, carry water