Knuth started writing the TeX typesetting engine in 1977 to explore the potential of the digital printing equipment that was beginning to infiltrate the publishing industry at that time, in the hope that he could reverse the trend of deteriorating typographical quality that he saw affecting his own books and articles.

https://en.wikibooks.org/wiki/LaTeX/Introduction

La razón de su existencia está más asociada a lo análogo que a lo digital.