Ok but what is the actual transmission rate? I get less people sick means less spreading but from my understanding a sick vaccinated person can spread it just the same as a sick unvaccinated person
What do you mean by that though?
If you mean someone who has gotten sick, with symptoms, and is all feverish and chills and terrible - does it matter if they were vaccinated before for their transmissibility, then no, they are almost certainly the same. (I doubt anyone has done a formal study, though.) Why would they be any different? Once you are sick, you are transmitting. There are no vaccines that change that.
I already said the other part of it is how long and how severe. If it is less, it is less.
You
cannot think about vaccines on an individual level. Nothing about why they work is individual when you are talking about a highly contagious disease.
That's why all this "it's my choice" / "Why are you worried if you're protected" talk is so frustrating to people. It completely misunderstands that is going on.
(It was the same things with masks and distancing. The fact that a cloth mask "barely protects you" was thrown around like it was some kind of "gotcha" by people who can't understand what's happening.)
Let's make a simple model that doesn't reflect the real numbers at all but just shows the concept.
Once infected past a certain threshold you are 5 points of risk to people you encounter while pre-symptomatic and 10 points when symptomatic.
Normal course of the disease for an unvaccinated person is 4 days pre-symptomatic and 2 days symptomatic.
Normal course of the disease for vaccinated person is 3 days symptomatic and 1 day symptomatic.
Who presents more risk to the population?