Sorry you are wrong, the MRNA enters the cell and there is every reason to expect there may be to much MRNA material which would overflow causing extracellular material floating around in the body which would then be attacked by the innate immune system.
Don't forget, lots of cells out there, one size may not fit all protein spikes.
Your opinion and my opinion. Sticking w/my own opinion since it makes a lot of sense.
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