I was reading an unrelated blog post this morning. Sadly I can't seem to find it atm.
It was about scenarios, often in movies or books, where someone (the protagonist, typically) experiences an event which is LITERALLY life-changing (Matrix and StarWars were cited as examples, as well as a jillion romcoms, etc.). That person changes at that instant and their life moves forward in a totally different manner/direction/whatever.
The author went on to write...although it might seem that a SINGLE EVENT was A HUGE turning point (which makes for a good story, at any rate), it was actually a culmination of many smaller things prior to that event that each contributed in some way. Without those seemingly small and possibly even unrelated events PRIOR to that HUGE event, the HUGE event likely wouldn't have changed the course of that individual's life.
The question posed in this thread reminds me of that blog post. And this may be why we are often revisiting the same or similar ideas (when to start SS, mortgage payoffs, conversions to Roth, mortgages in retirement, second homes, buying vehicles,...the list is endless).
We are all living life. In seeing a familiar topic resurface....time has moved on for all of us, we have had time to think about it, or someone presents a new/slightly different perspective on it, or we've learned something from watching TV or reading elsewhere, or heard from a family member's or neighbor's experience, etc. We may not connect all the dots that have gotten us to our current "new/changed" thinking, but collectively, something has "clicked" and caused us to change our mind.
omni