[fulafel]

Jonathan Blow is an opinionated game programmer/language creator who is eg concerned about memory management eating into his 360 Hz display frametime[1]. GC is still used in many games, eg Unity engine, so it's not a universally held view in the field of games. You should probably tell us more about what domain you are working in and/or read his opinions in the contex of his domain.

As for your (B), besides the "is it bad" essay question you probably want to look at languages specifically. As you know there are many Lisp style languages and they have big differences. Eg Clojure, Scheme and Common Lisp are all very different and have different kinds of communities. It's a language family of more internal variety than eg modern Algol style imperative managed statically typed languages (Java/C#/Go).

[1] A topic of some of his tweets recently