One of the things that was often mentioned in such discussions is sendmail. Do we need sendmail in base? It could be argued that it should be moved to the ports collection. On the other hand, we need at least some kind of mail delivery support in base, so things like cron jobs and the periodic script outputs work out of the box, which is essential. And sendmail is comparatively small – replacing it with a slimmer delivery agent won’t really save much space (DragonFly BSD did that, but for other reasons).