Well that's faulty thinking, both can be maintained simultaneously quite easily and there are many who do just that. Also those old traditions are in ways both direct and indirect responsible for the environment both physical and otherwise that is the very ground your success is built on. So caring about them is analogous to caring about your own prosperity. It's the 'no man is an island' lesson in its most natural and ancient form.
Pretty sure that whole people without personal prosperity are more likely to cling to traditions is your own confirmation bias there.
Plenty of people who think like you do say they're not needed, using the same terminology as you so excuse the confusion there, I am only a fairly good mind reader.