"string angle on the fingers" not only is it uncomfortable there MORE string on the fingers making the release more critical and unforgiving.

"My bows are smooth out to 30 inches." Yea that may be the case, but it's not the problem.

Bowmania

 

Longer bows have a higher mass too, in general, so there may be advantages there too.

 

Let's look at this a bit differently. I can make a 70 inch bow with any length riser by changing the length of the limbs. So why not a 21 inch riser with extra extra long limbs? Or a 19 inch riser with extra extra extra long limbs? String angle depends on overall bow length. Limb performance is specific to the limb design. If the limbs are too long, you will not hit the performance sweet spot until a very long draw length is achieved.

 

Well, certain disciplines or styles actually need the longer sight window, too. You might have a problem running your sight down to 90 meters in a 19" sight window, for example.