Who really knows why Taurus does anything they do?
I'm not aware of a 30-30 ever being produced, the current Brazilian website shows a 44-40 Winchester. Check out the Puma and Legacy Pumas (Rossi older production though). 38, 357, 45 Colt, 44-40 Win, 44 Mag, 454 Casull and 480 Ruger.
Here is a link regarding the AR.