To me, the loft ain't the problem but the nominal length is.
No matter what is engraved, the shortest wedges should bear 50 yds or 60 yds on them, neccessary for top precision shots from short range.
Traditionally, these have been 64° but this might have to change now.
BTW: Phil Michelson is one of those who has/had 64° wedges, but I only have an (almost unused) 60° in my real bag ;)