Delta variant has an R0 of about 7-8. Measles 12-18. And yet, measles is nearly eradicated in the US.

You are overstating the extent to which vaccinated individuals are likely to be infectious. But more importantly, you are ignoring the importance of the network effects involved.

For x to get to z through y, x has to infect y, and y has to infect z. If probability of infectious breaktrhough and a contact event is 20%, the probability of it getting to z from x, is .2^3 = 0.008. And yet, a 20% is really high-end estimate of that likelihood. You need to both have a breakthrough infection and be in the vicinity of others for potential transmission.

Two doses of the measles vaccine (MMR or MMRV) are highly sterilizing and 97% effective. That's far better than any COVID-19 vaccine, so measles isn't a valid comparison.

https://www.cdc.gov/measles/vaccination.html

Your other numbers are just made up and not worth discussing.

1. We're not done making COVID-19 vaccines. For you to declare defeat so early is purely anti-vaxx bias.

2. The measles is way more contagious. It's dreadful for you to simply ignore that when it matters so much to the calculations.

The thing about these results is that its mostly in people who show symptoms, and it isn't clear to me that symptomatic covid infections in vaccinated people are associated with similar viral loads as when asymptomatic.

I think this study tries to address this. But haven't had time to read through

https://spiral.imperial.ac.uk/bitstream/10044/1/90800/2/reac...