I don't buy the "Lisp is not concerned by implementation details" because all I see in Lisp are implementation details, namely everything is a singular linked l

I don't buy the "Lisp is not concerned by implementation details" because all I see in Lisp are implementation details, namely everything is a singular linked list and you have to go somewhat out of your way to use anything else (switch from lists to actual arrays, and you have to modify your code from using CAR to AREF, for example). Don't forget the numerous equality operators either (EQ, EQL, EQUAL, etc) whose results are most definitely dependent upon the underlying implementation detail (EQ compares pointers, EQUAL compares visual representations). For speed, I use profilers, because I'm still surprised at where the code is spending its time, even after 20 years of programming in C. I'm beginning to think that Lisp appeals to programmers that like programing in raw Abstract Syntax Trees which is a small subset of all programmers.