Originally Posted by: WhuneBut, but...

it's a fundamentally different sound!

It is a different sound, but I wouldn't say fundamentally different. :D

Maybe I wasn't precise enough in my answer. I'll try again!

Consider that any & all chord names are shorthand conceptual tags. Any chord symbol is just that: a linguistic symbol that can refer to a wide class of concretes.

If I tell you, or a piece of sheet music reads, "Play an A major chord", the question remains: which specific voicing in which octave? That is what music notation is for; to precisely specify the notes.

Because an A major chord can be played in many different ways, octaves or voicings. Likewise for a sus2 chord. So, unless I provide a specific voicing, any combination of the notes A, B & E you can find on the guitar is acceptable for an Asus2.

Makes sense?