Jammu Rajdhani skipping Ambala Cantt is fine, even 12013/14 Amritsar Shatabdi also used to skip Ambala cantt when it started.
Panipat is a much bigger city than Ambala and has economy double than Ambala, it can give more pax to premium trains like VB, Shree Shakti and Amritsar Shatabdi.
IMO...
more... Panipat deserves stoppages to below trains-
1) 12029/30 Swarn Shatabdi
2) 22461/62 Shree Shakti
3) 12203/04 Garib Rath
4) 12413/14 Pooja Express
5) 22447/48 Vande Bharat
Even if these 5 are accorded stoppage, i will salute this Double Engine govt for not neglecting Haryana. As of now, this is the worst ever Govt of Haryana. Though MP is doing good job, but Central govt not listening to him.