Only if you feel limited by modality… But I think this is more a cultural question. Western modern music often tries to break out of modality by extending and experimenting with harmony, but take a look at Indian classical and you don’t see modality a problem anymore. I think the question is a bit similar than when we work with sequencers. I haven’t seen one contemporary groovebox sequencer that allows easy sequencing of true polyrhythms. I have played handpans for a decade and I don’t think their modality is limiting. It’s just another limitation that you accept when you start making music with them.
Yeah, but my point was that physical simplicity does not equal limited expressivity. A great handpan is definitely on the same level of dynamics and expressivity than any hand percussion. There’s all kinds of mutes, bends, slaps, harmonic isolations etc… In fact, you can’t even do that stuff on a piano, yet no one complains about it. 
It’s also good to keep in mind that the handpan is only about 20 years old instrument. There are incredibly talented musicians working with it, but we are only beginning to realize its’ full potential.
Not exactly sure what you mean by this, but with a good handpan the sound comes from the player’s fingers. They are extremely sensitive instruments that reflect player’s skill level in a very direct way!