When someone talks about "end game" ambitions, they are still
chasing the rainbow. What I learned from going "end game" a while back is that it leaves you still wondering if there's something you can improve, or you question your choice 6 months later.
If I am honest, my end game chain looked great, but deep inside I was a bit underwhelmed by the marginal improvements - when gear is already very good, and when the music is great, hey, might as well stay put. My "end game" gear sounded great in a big listening room, but 15 years later, after divorce and with a smaller place, it just didn't work and was too big and overwhelming. I then went through a number of changes/upgrades for a few years, until I settled with what I have right now - and yes, LS50 with a great amp and a sub or two will truly work brilliantly, thank you very much. And I did own $12k bookshelf speakers to "upgrade" from LS50 I acquired in 2013... and after a few years, I went back to the LS50.