Freezing your credit is a powerful way to control losses from someone opening a new (and of course unauthorized) account. It would not stop anyone from possibly diverting your mail, and effectively gaining access to the account. It comes as a cost, which is that it significantly slows the process of gaining approval for new credit. I am rusty on the process, but it effectively requires you to unfreeze the account, then apply...then refreeze most likely.
I decided not to do this. Bu that is because I weighed the benefit of potentially easy / emergency access to credit, against potential intrusion...and decided on the former.
But if you are someone that really has no plans to borrow, then this is a powerful tool.
I decided to compromise by locking out the account from solicitation inquiries, and the other measures above.
Please do take some measures. Identity theft is one of the fastest growing crimes in the US, and it is a disaster when it occurs.