You're missing a lot. The minor feasts and Ember days each have special readings; Holy Saturday has like 12. There are direct and indirect quotes of Scripture in the "non-readings" portions of Mass (Introit, Gradual). Plus, the Divine Office covers all the Psalms and has its own readings each day; it's considered part of the liturgy.
I’m quoting from a Romam Catholic source. Nothing was left out. Note also I provided pre and post Vatican 2 information. Bottom line is your claim about the Mass gave us Scripture is bogus.