I don't know what people expect from a 'Piezo' - its obviously not the 'same' sound as putting a mic in front of an Acoustic and recording whatever that mic picks up in that specific position, but for a lot of 'stage' musicians who want an 'Acoustic' like sound, they may well use a Piezo pick-up plugged into an Acoustic and that sounds very similar to a Hollowbody Piezo. Its not that dissimilar.
If I was a 'recording' artist, then I'd probably rather set up a 'mic' to record the guitar, maybe a second mic and/or a direct Piezo recording to create a 'blend' to get the 'perfect' sound required but then if I were to play on stage, I'd probably just take the HB2 and use the Piezo for Acoustic parts and have the Magnetics too without needing to swap instruments or have an Acoustic mounted to a stand with a 'mic' fixed in front at the 'perfect' spot to use.
A Piezo generally sounds like an 'acoustic' because a lot of Acoustics have Piezo pups - if you choose to plug them in rather than go to the effort of micing. That sound has become associated more with acoustics for this reason and I think the HB2 competes very well with even high-end Acoustics plugged in.
This is a comparison between the SE HB2 and a Taylor 317e - apart from the 'lack' of String Squeak (preferable to me), the HB2 sounds great and very 'acoustic' like to me.
I remember when the Parker Fly released, the first guitar I played with a Piezo and marketed as able to deliver 'acoustic' tones for gigging. That versatility impressed me back then