I think sometimes "need more data" has a similar connotation as "citation needed". It's a way to dismiss an idea you don't believe in without being fully dismis

I think sometimes "need more data" has a similar connotation as "citation needed". It's a way to dismiss an idea you don't believe in without being fully dismissive. In other words, it can be a way of saying "I don't think it's obvious that your idea will float, but I'm willing to accept it if you can provide evidence for it". Of course there's a risk for bias here, you'll be more inclined to trust a close team mate than someone with just as good arguments outside your team which can lead to unlucky territorial behavior, even when intentions are good. But at least it leaves an opening for challenge that "nah, I think it won't work and I own the code, sorry" does not.