1st of all, it wasn't only kumaon regiment who fought in NE. And role Intelligence agencies played was key in reducing militancy there.
2nd don't compare an infantry regiment with special forces regiment. The quality, skills, training needed for special forces soldiers are very different from infantry soldiers.
Casuality rate of kumaon regiment from their fighting in NE over decades wes more than the total strength of parachute regiment.
I was talking about the quality, skills which they displayed at vajra prahar 2018 (which western SF guys still uses to troll indian SF on social media). Most of the soldiers who participated in vajra prahar doesn't even know how to hold a pistol. During room intervention, one US soldier pushed indian soldiers for blocking the entry,..!!! Which was very basic thing and para soldier done it wrong.
No one can justify 3 para SF's incompetence by saying they had a history of so called "curbing militancy in NE" which btw is still an ongoing issue. We cannot blame the western SF guys for those 3 para sf's lack of skills either as they(western SF) have experience of training and interacting with dozens of professional special forces around the world.