No doubt, it's an old design...stemming from the '80's.
However, it's simple and no frills..which is what I want in a tractor. All the gadgets..cruise control..sorry, I've no need or desire for that.
And, considering the power, that 790 series is a heck of a machine and a great deal.
But..it is an old design...but has a lot of years left in it, if Deere continues to sell it. Reliable...easy to work on...parts are readily available. I suggest in 30 years, 790 (and 990) parts will be around (I won't though!). Do you think all the electronic gear on Deere's (and the other brands) will still be around?
So, why do you even bring this topic up?
If you're considering a 790..well, you said yrself it's an old design. As an owner, I'm recommending it as a stout tractor for a 3 to 10 acre residence..or as a second tractor for a small to medium sized farm.