Qualities Of An End-game System

The need to reproduce the musical venue is one function of a system. I like to call it the "Disney World" function, because it produces the kind of illusions which trick and delight children of all ages.

Other musical pieces are masterpieces of collage -- multi-tracked. Think of Dark Side of the Moon. It is immersive but it is not "realistic" in that simplistic Disney way. Others are electronic. They, too, lack "realism," but a good system will produce tonalities which are arguably more important than spatial simulations. 

I know people for whom the gear is the endgame. I do not just them as being wrong. Let 1000 flowers bloom.

The OP's description strikes me as "first level audiophile" not "end game." 

"End game" indicates a superlative system, one which likely cannot be bettered.

This hobby is filled with hyperbolic descriptions. If we want to talk seriously, we need to avoid hyperbole.

Theoretically,  what more do we need besides the enjoyment of music?  

Some of us like to tinker and hear differences. It is not only about the music.

The notion that upgrading or changing is only due to OCD is false, or this wouldn't be a legitimate hobby, it would be a psychological support group. I'm not saying you said this, but too many people equate changing things or upgrading things with a disease. This is a puritanical kind of remark and I reject it.

“End game is when you no longer feel the need to upgrade.”

I felt that way and then I heard a much better and more musical system and room than mine. It showed me that there was more to hear, more work to do.

New experiences changed my feelings. They alerted me to richer experiences I could strive for. 

I suppose the statement is still true, but I made the mistake of thinking I felt something capable of ending my search and I was wrong.