Originally Posted by 'nother

However, relative to Sheldon's article, what I'm referring to is the part that says: Long-cage derailers have greater takeup capacity, and work with all types of cassettes.

Which to me is a bit misleading, based on my understanding and first-hand experience, which is: simply being "long-cage" does not mean a RD will handle any cassette (e.g. any cog size, which is what I assume Sheldon means when he says "all types of cassettes").

I do not think my understanding is flawed as you proclaim, but please feel free to correct as necessary.