probably the most functional and well-supported modern LISP machine we have at the moment is probably EXWM, combined with using EMACS for as much of your work as possible.
it is true that it is sitting on top of linux, for most.
however i am absolutely astounded at the advance you make into the LISP world just by having your visuals changed from, say, in my case, MATE to EMACS as the window manager.
all of a sudden it is easier and faster to perform maintenance and upgrades inside an EMACS environment.
this is quite scary, the LISP machine of the modern era is slowly emerging in the underground areas of the free software movement: first you have GUIX, and then you have EXWM, as well as faithful old EMACS…
i wonder how far i can take this?