In breakthrough cases in the vaccinated population, their viral load has been found to be just as high as the unvaccinated population. According to Dr. Fauci, this is actually why the CDC changed their masking guidelines for vaccinated people.
...aaand one day later the CDC says the direct opposite in order to justify a new mask mandate, citing unreleased but super scary and definitely trustworthy data.
That’s just grasping at straws. If you try to get a holistic overview, no single measure is 100% effective. But you can combine masks, vaccinations, social distancing, etc. till pandemic stops to be a problem.