Yep, that sounds like Eric... or Karl.
I thought night sights were more valuable until I took a class and did some night shooting. The gun I used (Ruger SP-101) did not have night nights. I did just fine.
The truth is that night sights help in that narrow situation where you target is lighted enough to be visible, but your sights are not. In reality, if you target is lighted at all, you can usually see your sights shillouetted against it. The night sights can just help you find the sights quicker.
In the class, I used a flashlight and had no problems picking up my sights against the well-lit target.
That being said... if you want them, there is no real reason not to have them.
Keep in mind that Eric and Karl don't really believe the R-9 needs sights at all, and only made an R-9s in response to consumer feedback. If they think it doesn't need sights, they sure don't think it needs nightsights!