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Some educated guesses:

1. We don't have "ribosomes at scale"

2. We don't have a way to separate the ribosome product from the factory

3. Keeping the product stable is hard

Another interesting reason is that if you do it the mRNA way, you will continue to internally produce those spike proteins to train your immune system for a week or two

Basically it takes longer to produce them at scale, and they've been less effective at preventing covid infection in clinical trials.

The non-mRNA vaccines do work like that. They use big vats of bacteria as bioreactors and ship the finished product.

Long term, mRNA is a more flexible solution - just ship the blueprints and let people make it themselves.