Top of my head, new things have unbounded potential, existing ones have known potential. We assume the new will be better.
I think it's part of the reason stocks almost always dip after positive earnings reports. No matter how positive it's always less than idealised.
You might think there's a trick where you can sell maintenance as a new thing but you've just invented the unnecessary rewrite.
To answer your question more directly, once something has been achieved it's safe to assume someone else can achieve it also, so the focus turns to the new thing. Why else would we develop hydrogen or neutron bombs when we already had perfectly good fission ones (they got commoditised).
I think it's part of the reason stocks almost always dip after positive earnings reports. No matter how positive it's always less than idealised.
You might think there's a trick where you can sell maintenance as a new thing but you've just invented the unnecessary rewrite.
To answer your question more directly, once something has been achieved it's safe to assume someone else can achieve it also, so the focus turns to the new thing. Why else would we develop hydrogen or neutron bombs when we already had perfectly good fission ones (they got commoditised).