Earlier quoted context omitted.
Because it can easily solve or altogether eschew a lot of the issues that object-oriented JavaScript developers are struggling with and that's barely scraping the tip of the iceberg of problems which Lisp doesn't suffer from. Alas one of the problems Lisp does quite acutely suffer from is that SBCL has become a defacto standard and its support for anything that isn't GNU/Linux (like Solaris / illumos) is dismal.
SBCL is open source, so you are free to improve the support for Solaris.
By the way expecting that something be fixed by a non-specialist just because something is open source and expecting someone to sink their extremely valuable free time so someone could break and destroy that work again, well, that's not only despicable, it's extremely infuriating.
All the more infuriating as SBCL wouldn't exist without Solaris, which means someone already broke it at least once and here you come expecting me to not only know what to fix, but invest my life into something where my effort would likely be broken upstream again.
This needs to be taken up by the core SBCL team. Meanwhile, pity the time I used to report bugs which just sit there unhandled.