Congratulations on a setup that you enjoy! It's great to get to a place where powering up the system and playing music gives the pleasure, without any nagging daydream of "what if " I made a change over here...
On the other hand, I'm a happy tourist that likes to sample gear. So I continue to assemble systems, and enjoy the idea of a bedroom or second system as a way to rotate pieces. I might find a combination that surprises me. This style also ensures a decent set of backups if something heads off for service.
I am also retired and trying to stay within a budget, more or less. Would I like a set of Quatros? Sure I would. Meanwhile, there's music to enjoy.