Fundamentally it comes down to style. Two practical reasons are: - to more easily distinguish 't' from similar characters, such as 'f'. Particularly with monos

Fundamentally it comes down to style. Two practical reasons are: - to more easily distinguish 't' from similar characters, such as 'f'. Particularly with monospace fonts, rigid adherence to rules can result in character confusion. - to balance the foot of the 't' which extends to the right.