https://www.businessinsider.com/covid-vaccine-effectiveness-infectious-fully-vaccinated-people-clear-virus-quicker-2021-8username in 2021 wrote:
“The vaccines prevent transmission because
1) they prevent against infection (even if that protection is weaker under delta)
2) vaccinated people clear the infection much faster so the infectious period is shorter”
These are good points. Are there good studies that show evidence of point 2?
This is just one source. Many others/studies out there. Quick google search brought it up