First you say it wouldn't be possible (Hashes are not interpolated becuase they are not sequential objects.), then you say it would be useless (Using them in that way does not really make sense). Both statements are false.

The sequence changes when elements are added (or removed?), but that doesn't mean there isn't one. It would just as simple to support interpolation of hashes as it was to support interpolation of arrays.

Some problems with implementing it at this point include backward compatibility and the possible resistance at adding another special variable (like $"), not a supposed lack of sequence.

As for it being useless, that's untrue because I sometimes print the content of hashes without reordering them.