It sounds like a pretty natural shift tbh, and I don’t think it needs to be a “problem” at all. When you’re younger or in a more hectic phase, being busy can feel like proof you’re doing life right. Then at some point the appeal of constant plans just drops off.
What links this with the organiser post is realising how much energy you were actually spending, not just socially but mentally. Always saying yes, always arranging things, always being “on”. Once you step back, you notice how nice it is to protect your time and only do what you actually want to do.
Friends can joke about it, but feeling more rested and content is a pretty good sign you’re listening to yourself rather than running on habit or guilt. I think for a lot of people it’s a mix of age, burnout, and better self awareness. Less about becoming boring, more about becoming honest with your own limits.