Have you found your "End-Game" speakers yet? I have. And it feels so good!!!

JBL  4350 with JBL 2397 horns and 2440 drivers.

I like my ProAc D40R but I doubt they’re end game. When the mood takes me I’ll probably be tempted to switch.

Depends on whether you’re talking about components/systems that you don’t feel the need to ever change, regardless of inclination/budget or those to which you have such an attachment that they’re going nowhere, ever. In the first category are my Martin Logan Spires (and Martin Logans in general). I’ve been tempted of late to change these for 15As, but every time I listen to them, I think, "Why would I want to change?". Budget probably won’t change though for a few years even if I change miming - I’m building a passivhaus, which is going to swallow all available resources (as an aside there, our passivhaus consultant deeply disapproves of valve and Class A amps - or would if they knew what they were 😆). In the former are my Spendor BC1s and accompanying Quad 33/303 - I bought these in 1977/78 as a student and they’re most definitely keepers. I also have the astonishingly synergistic combo of Tom Evans/Graham Fowler’s amp. designs: the Finestra 3-box preamp and the Alecto II+ monoblocs, plus Hydraulic Reference turntable

After owning Magnepan, Sonus Faber, Vandersteen, Avalon, and Mirage speakers I now have Wilson Audio Sasha DAW speakers, which will (probably) be the last speakers I will own. They complete the dCS, Dan D'Agostino, ARC, Clearaudio, Koetsu, Transparent Audio system that is very synergistic.

My end game speaker is the monitor audio platinum 200 ll, and I will be rewiring the internal wire with OCC single crystal which will give me maybe a 15 to 20% improvement right across the board, OFC wire which most speaker companies use is junk, OCC single crystal is far superior for audio, I did it with my last monitor audio gold 300 G4 and I got a 10 to 15% improvement in everything.