Common Lisp standard (and its implementations) really needs an uplift to shine. There are so many shortcomings and missing features in it that listing them here would take a lot of space. Instead, I will point to some proposals like Common Lisp 3[1] and Compact Lisp[2]. Meanwhile proper typing should be introduced out of the box, like in Coalton[3], for example. Also, pattern matching should be the part of the language, not some external library [4]. Even something basic but foundational is not yet standardized - Unicode support!
[1] https://github.com/blakemcbride/common-lisp-3
[2] https://github.com/lassik/compact-lisp
[3] https://coalton-lang.github.io/
[4] https://lispcookbook.github.io/cl-cookbook/pattern_matching....