Interesting that Michael wrote that 11 years ago and that it is still a relevant partitioning and categorization of Lisp languages.
I love the Lisp ecosystem and my only real regret is that PicoLisp does not run on macOS because I think as a tiny Lisp that it is practical for some applications and there are several very interesting programs written in it.
The easiest way to do this on a M1/arm64 macOS system that I found was doing a 'brew install lima', start lima, apt install picolisp+emacs, then set up plisp-mode.
This is a fast setup to run Emacs+picolisp in a Mac terminal, and file sharing between Linux and macOS is OK also.
I've also only played around with picolisp, but thought it was pretty cool. The design ideas are kind of cool for sure, but I can't put my finger on why.
I love the Lisp ecosystem and my only real regret is that PicoLisp does not run on macOS because I think as a tiny Lisp that it is practical for some applications and there are several very interesting programs written in it.