Indeed. Silence is golden. If your celebrant seems allergic to it, you might add the psalm Miserere, or a penitential chant such as Parce Domine or Attende Domine.it is not strictly required to cover all the proceeding with sound of chant
I don't know that there were any.historically, what the alternatives were.
No, it's not. Motets have been permitted during the liturgy for centuries. If you never sing anything but psalm/canticle verses to prolong the Offertory or Communion chants, I can't fault that, but the remaining alternative to a freely chosen Latin text, suitable for the occasion, which you find uncomfortable, or silence, which you find unfitting, is to repeat the appointed chants. The rubrics and other liturgical regulations are not necessarily meant to address every possible foreseeable circumstance, so there is no single "correct" answer as to what may be sung when time remains.The path that leads to ‘alius cantus aptus’ is uncomfortably wide!
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