This, I could not possibly disagree with more. Ramin wood is worse than useless. Horrible splintery crap with an unpleasant tendency to break straight across the grain. It also seems to develop what I can only describe as "grain crush"... which will then break straight across the grain. I would rather use a rod made of tulip poplar or yellow pine than one made of ramin wood.
As for ash, I don't know.... The solid layers of ash is pretty amazing stuff. The porous layers... not so much. Quite weak, in fact. If you could manage to split out an ash ramrod of all summerwood (the dense rings), you'd have something for sure. These layers are generally not that thick, though, and you're probably gonna get springwood (porous rings) in your ramrod, which I would be afraid would be prone to splitting. I haven't tried yet, though.