The Rule of Idem Sonans

Idem sonans (Latin: sounding the same) is a legal rule that provides that absolute accuracy in the spelling of names is not required to enforce a legal document. People cannot avoid contracts merely because their name is spelled incorrectly. Quoting from a Michigan State Bar Association Uniform Jury Instructions:

Differently spelled names are presumed to identify the same person if they sound alike, or if their sounds cannot be distinguished easily, or if common usage by corruption or abbreviation has made their pronunciation identical. 

If this is good enough for law, why isn't it good enough for some genealogical researchers? I am still getting people who are hung up in their research because the "Names aren't spelled the same." It is long past the time to move on from this position and realize that names can be spelled different ways.