What does one purchase after owning horns?

There is little reason to acknowledge it. That horns can produce sounds that can fill a stadium better than typical domes is irrelevant for most of us. Those volume levels aren't needed and for the sake of our hearing not desirable. Even without things like vented baskets, and ferrofluid cooling, dynamic tweeters are typically capable of providing more than enough volume for typical rooms. Typical dynamic tweeters have proven themselves to be remarkably reliable, and even more so, with extra power available to them.

This tweeter discussion is largely atopical since half of us can't hear beyond 10 Khz. The mid range is where our discussion should be centered because that is where most of our material comes from.

In my experience, nothing else produces quite the same caliber of mid as my horns. Other designs seem like toys by comparison.

Isochronism,
You're right of course.
Being a dillitante is part of the audiophile sickness, one that I certainly have.
I really did have to design my own speakers, to have something that I didn't grow tired of.
The issue is now, I didn't make them 'no holds barred', cost NO object.
The closest were the one off LSA10's.
Those remain, one of the very best speakers I've heard...topped only in certain ways, by VERY expensive designs.
They weren't cheap, would have had to sell for $50K at least, and that was based on plate aluminum/cnc cutting for that plate aluminum at an aerospace company.
So, yeah, it's a blessing AND a curse to hear and quantify to an exacting level, but I love music so much, I try to just slide into the music and not critique.

Good listening,
Larry

I have tweeters in my B&C DCX 50 coax drivers but I have never hooked them up to an amp. If anything is missing, I don't miss it.