I would suggest NOT eliminating this, but instead providing a brief explanation (like a pop-up in the wallet when you mouse-over the orphan, or something similar; or you could change the text to e.g. "Generated but not accepted: this is normal and will not affect your overall reward rate"). Orphan blocks are inevitable and relatively common in every PoS system; they aren't something to be ashamed of or hide. However, I can see how it might confuse and concern people who are unfamiliar with how PoS works.

The main reason I suggest NOT eliminating the "Generated but not accepted" message is that, while a user can't eliminate orphans completely, they can take steps to reduce their frequency (e.g., see here: https://steemit.com/cryptocurrency/@lightsplasher/proof-of-stake-coins-reducing-orphans). However, they can't take appropriate action if they don't know their orphan rate to begin with. Also, removing this information could open you (the XSPEC project) up to allegations that you're trying to hide something (i.e., that staking really is broken)--and I think that could be more damaging to the project than the complaints of a few people who simply don't know how PoS works. Ignorance can be solved with a pop-up 'tool-tip' explanation; suspicion and FUD cannot.