Claude Code could already be used in non-interactive mode, and by extension it could be integrated into other apps in the same manner as any other UNIX command

Claude Code could already be used in non-interactive mode, and by extension it could be integrated into other apps in the same manner as any other UNIX command line utility. This SDK currently supports only command line usage. Isn't that just what we already had? I don't understand what's actually new here. What am I missing?