> So yes, you can theoretically spread it, but once vaccinated you're about as effective at spreading it as a doorknob someone sneezed on

You should most definitely point out that yours is a conjecture. A reasonable one, but still completely unsupported by clinical data - not because data refutes it, but because there is no data. All trials only examined the reduction of symptomatic infection; they didn't even try to measure whether vaccinated people were able or not to spread the virus.

I would expect your conjecture to be true, but humans are weird, viruses are weird and medicine should be based in evidence, and evidence isn't in yet.