Because very few people want to do that. Many more people want syntax highlighting, automatic backups, vcs support and a kitchen sink full of plugins. If suppo

Because very few people want to do that. Many more people want syntax highlighting, automatic backups, vcs support and a kitchen sink full of plugins. If supporting feature x that nearly no-one wants makes popular features a, b, c much harder to implement then it generally makes engineering sense to forgo x.