You are mixing things into that list. Common Lisp, Racket, Clojure, and Shen are different languages, serving different purposes, etc.
"Franz", "Allegro", "ABCL", "SBCL" are implementations of Common Lisp, exactly the same language.
ALGOL-family languages are also "fractured" into Algol-68, Pascal, Go, Ada and others, that's not a problem, since they are really different languages that give different benefits/etc.
>"4.) poor windows support for SBCL"
SBCL works just fine on windows. But if you don't like, just use CCL (Clozure CL). I'm currently on a Lisp project which runs equally great in SBCL and CCL. CCL is professional quality software.
>6.) multi-core seems to only be in Clojure
False. There are many libraries to do all sort of concurrency and multiprocessing on Common Lisp.
>8.) learning resources are very hit or miss
At least for Common Lisp, there are books that are arguably some of the best books on programming ever written, like "Practical Common Lisp", or PAIP. For Scheme, "Structure and Interpretation of Computer Programs" is already a high-rated classic.
>notice how many people equate lisp with personal projects?
Except when it's used by Rigetti for quantum computing, or Grammarly for the core server of their core business.