I noticed that the smallest blocks from Hiwin, the 15mm, have a dynamic load capacity of around 2300 lbs each (11K+ Newtons). Static load capacity is double that. Is this correct?

That's about equal to a 1-1/4" Thomson SMART bearing, and higher than that of a 1-1/2" Thomson SUPER bearing. Pretty incredible from such a small block.

So why do people even bother with 25mm+ blocks on lightweight routers? I'm thinking it's because of ebay.