By using multiple personas, and testing a task against each, you can ensure that your design is more inclusive
I think the above points are very solid and have a good flexibility to them in terms of accommodating to many people. I agree with the sentiment that using multiple personas is more inclusive in comparison to only using one persona. Another benefit to having multiple personas is that if you misrepresent your users with your single persona, you aren't putting all your eggs in one basket, so to speak, and still have other personas that might more accurately reflect your users.