The Mag Card was essentially a word processor, and did not compete with the MT/SC. But IBM also introduced a Mag Card Composer, which did. There really were two

The Mag Card was essentially a word processor, and did not compete with the MT/SC. But IBM also introduced a Mag Card Composer, which did. There really were two very different use cases: general-purpose word processing one one hand, and composition on the other hand. The latter implied proportional spacing, justification, good-looking fonts, and accessories such as high-quality paper and specially-formulated ribbons.