Not that I’ve seen really, but I haven’t looked much outside the mainstream as my 12 mini is still going strong.

But seems I’m either in a real minority with regards to phone size preference, or at least the manufacturers believe I am.

The modern "flip" foldables like the Samsung Flip and Moto Razr let you do a lot on the front cover screen these days. When folded they are pretty comparable to early smartphones, like a wider more square Palm Pre.

There's a few small traditional phones from companies like Unihertz but they don't have the same support or power.

Unihertz Jelly series makes being small their whole selling point. They're not just average sized, they're small small. You could wrap your whole hand around it. Often suggested to help combat phone addiction because apparently smaller screens do something for that.

Not branded/high end ones sadly.

It depends on what your definition of "small" is. If you consider the iPhone 13 mini as small the only thing that comes to mind is the Unihertz Jelly Max.

quite a few: Qin has some models. Sometime there are some startup on kickstarter that do small phone. Ikko mind one

I think we already have enough technology to make a mobile phone that is thinner and smaller than current ones.