ur first point : To save time of loco change at BZA. to save 10 mins u r asking to travel 1.5 hr more ??
ur second point - connectivity to BBS visakha is doing d purpose.
and for to rayalseema - it has no sense to divert this already full running train through a long royte.
Instead can wish...
more... for a new service or extension of amaravathi to CCT/VSKP at the least.