Because Lispers sneered at the microprocessors of the time while everybody else piggybacked on them. And, by the time that attitude changed in the early 90s, there were already socially entrenched languages that had the "superpower" of garbage collection (Tcl for ECAD, Perl for sysadmin).

Nobody in the Lisp world ever took the time to implement stuff that people wanted on those tiny machines. Or to demonstrate to people the cool stuff it could do.

You can see this in Dr. Dobbs Journal. People are doing things like drawing graphics, writing spell checkers and controlling modems. Assembly and BASIC are normal but C and Forth are mentioned regularly. Turbo Pascal pops up in 1984. Some of the names are famous enough that you recognize them even now, decades later.

Lisp just ... gets barely mentioned in passing sometimes. And nobody of note writes anything about it. Somebody could have built a word processor, a spell checker, a chess game, a reversi game, ANYTHING ... but nobody did.