When compared to itself, that is an excellent description. And to an owner choosing to keep or trade, it describes things well.
But, to a new buyer obsolete has more to do with perceived value. When a buyer considers the 790, they usually are considering value very strongly. How does it compare to offerings from what Deere's competitors have? The playing field is pretty deep down there, as no frills traditional designs is where any brand will seek to start out and earn a reputation. When a friend of mine was shopping for a budget tractor, it was hard to see that the 790 was a contender when also looking at offerings from New Holland and Kubota, let alone considering MontanaKiotiBransonMahindraCub. (all of which are fine machines) The 790 is a great machine, and someone who owns one is likely to be very pleased with it as long as it meets there needs. But that doesn't mean that new buyers will consider it a strong value.