You can get this kind of information from ever major manufacturer, even on bikes that they haven't sold for years.
Well, it would appear that this "manufacturer" can't actually supply the information.
I could spend hours tracking down the bearing specs, or getting someone to pull the bushings (they're press fit) and measure the bearings. Probably take 10 minutes to find the bearings on the web, a week to order them, then get them pressed in. I'd lose all that time riding. The bearings are pretty small, so I'd wager they'd be trashed again in a few weeks.
But if REI is willing to take the lazy way out and just give me a refund, why should I argue? And I get to try something else that might work better for me. Seems like a no-brainer to me.