Probably not, but it’s better to have it and not need it. If an issue does come up, you’ll have the affidavit. It costs about 500 rupees, so keep away from anyone who asks for more than that because they will. One guy tried to charge me 2000 for it.
Yes, it’s less hassle. You’ll have a notarized affidavit that says both names are correct and of the same person. You wouldn’t need to do anything else and carry on with whatever name you have on your certificates.