no standard for threading, poor to nonexistent threading support
interpreter can't be loaded as a library in c asdf-install (every single thing about it)
unchecked/undocumented conditions
have to code in emacs
compiled binaries are too large to distribute
for every mandatory feature of a software platform, there is one implementation that has it. these are not the same implementation.
horrible syntax (parentheses (nesting (15 layers (to do the simplest thing (required (also algorithms (must be inside out (unreadable)))))))))))))))))))))))))))))))))))))