@displayname
I have been "in the game" for ~50 years, and have owned more than a few high-quality amps over the decades. Your post, in a sense, anticipated one that I plan to write over the coming weeks. The much longer story short, is that I have just recently acquired an LTA z40+, and consider it to be my favorite yet.
Like you, I tend not to flip gear regularly, but rather prefer to find a component that I really like, and live with it for years (at least), and I expect that it is likely to be the case with the LTA.
My previous integrated was a (Polish) Circle Labs A200, with which I could easily have lived happily for the rest of my audiophile days. It is a superb hybrid amp, and those interested can search for an extensive review done by @grannyring on this forum.
Interestingly, as you mentioned Jeff Rowland amps several times, I was a big fan of their original Concentra, and owned one during the early/mid 2000s. But as I haven’t listened to their more contemporary offerings, I can’t offer any opinions on them.
I have also owned Pass, Bryston, Gato, and Accuphase integrated amps, to name a few, and listened to many others. But there is something decidedly different, and uniquely attractive about the ZOTZ, David Berning designed amps, when paired with compatible speakers.
Note that while the (small) LTA staff tend to be responsive and helpful, the current tariff uncertainties are keeping them busier than usual, so I’d advise being a bit patient in terms of communication.
I wish you good luck, and will be interested to see where you end up in your quest!