Because most of the financial advice are created for middle class to poor.
Like
50/30/20 rule, if someone earn $60K per year in US, it's make sense to use that rule, but if they earn $1.2 M per year, it's not make sense for someone to force themselves use $60K for their monthly needs.
When someone is too rich, there are no rules, even they can buy the rules.
Well, I don't by far make $1.2M a year. Mine is more of an in-between case that started with that kind of advice, budgeting, saving and investing. Over time I managed to increase my income and therefore save and invest more (while being able to spend more). As the ball has now reached a certain size I can afford to relax a bit in that sense, and knowing the basic rules and having practiced them for a long time it is as if I have them internalized.