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If chruby-exec were a function, it would always run in the current shell. It could also reuse other chruby functions.
(chruby $arguments && eval $command)
If chruby-exec is a function, won't it no longer be usable as a way to use chruby-based installs via cron?
Correct. It would force users to explicitly invoke chruby-exec within a shell. This would be one way to prevent users from invoking chruby-exec under the dash shell. Of course, maybe people should just go back to bash -l -c "chruby ...; command here".
bash -l -c "chruby ...; command here"