Cannot use String.Empty as a default value for an optional parameter

Question

I am reading Effective C# by Bill Wagner. In Item 14 - Minimize Duplicate Initialization Logic, he shows the following example of using the new opt

Answer 1

I use string.Empty purely for readability.

If someone else needs to read/change my code later they know that I meant to check for or set something to an empty string. Using just "" can sometimes cause bugs and confusion because I may have just forgot to put the string that I wanted in there.

For example:

if(someString == string.Empty)
{

}

vs

if(someString == "")
{

}

The first if statement just seems so much more deliberate and readable to me. Because this is just a preference though, I really do not see the train-smash in having to use "" instead of string.Empty.