If that's what you want, that's excellent!
But perhaps it doesn't make 'financial sense' to buy the house after those 20 years, right, because you'd be better off just holding the money in index funds (or at least you'd be better off treating the home as an investment and not actually developing an emotional attachment because then you'll never sell it).
What I'm saying is - you have to spend money eventually. Very few people are in a situation in which they can just stash away 10M, spend 1M of it, and have the majority of their funds exist as investment money, and thus act in this sort of 'financially optimal' way.
Unless they want to live an austere life - which again, is fine! But it's not literally the only way to live.