Reason for T tail
It acts as an end plate for the rudder & thereby improves efficency which means you can have a smaller rudder. Regrefully this is compromised by the need to make the rudder stonger to hold the T tail so really the reason was the need to look different
Look at ac of that era.
Bonanza backwards sloping rudder
Mooney V tail
Cessna boringly conventional
Piper um I wonder what we could do ..... Tomahawk, Seminole, Arrow IV ..