why is a 13" tonearm design really superior?

I'll see in detail that Thales at the table of an audiophile friend in northern Germany in August.
From simply looking at the principle and technical problems incorporated (1st bearing being very close to the cartridge, more moveable parts than usual, increased horizontal moving mass etc.) I am really curious whether the technical execution and fascinating idea will give improved sound regarding 12" top-flight tonearms.
The advantage in tangential error is there, but you have to pay for it with several technical drawbacks.
We'll see.

Here are some pics
http://www.euphonia-audioforum.se/forums/index.php?showtopic=6887&hl=thales&st=45

Mathematical explanation:

The cartridge traces out an arc as the arm moves from the golder to the center of the record. When the arm is short this arc is very curved on the region between the holder spindle, where as if the arm is longer the arc becomes less curves. Now, when the arc is bigger and relatively less curved, it maintains tangency for a brief period just like the short arm, but the error dur to the curvature is minimzed. I suppose you can call it more tangent if that makes any sense.

I promised to report about the 24" tonearm I have seen on a pic - it is a design of German tonearm designer Fuchs. A friend of mine told me that it sounded very good. 24" inches - not too short...

We next aught to work on a 24'long, what say you?
Like a low resonace pool-cleaner tube?
Will like major minimise the tangent error, no?
Got to have some fantasie else things are not moving foreward here, I say.