I couldn't tell the sound diff between high & low anyway. The swept wing blade is quieter, cheaper, nothing to go wrong.
I don't blame Trane's relationship with big orange for cheapening of any product. The entire industry is responding to John Q. Public's demand for the cheapest price they can get. Only way to do it is cheapen the product.
What's the best made furnace? A ThermoPride. What's the most expensive furnace? A ThermoPride. What's the least sold furnace? ThermoPride. Can't have the best for the least and the public wants the least $$.