You are correct… I seemed to have a couple other systems. They have never been extra systems, but for a special location.
I have a system in my office. It started with cheap PC speakers twenty years ago. I used to work a lot. Typically a couple hours or more a night. So, I upgraded one piece every once in a while… until it was pretty good.
I started a headphone system at work twenty years ago. Same kind of thing. It was in between upgrades of my main system. Well, I am an audiophile… so, slowly over the years I upgraded it.
For most of my five decades I never had a second system of any kind. But I would not create another sit down system for the purpose of normal dedicated listening.