It makes little sense to bait a fighter jet for a sead mission when there are credible alternatives, I think IAF also have this view and hence NGARM is fit as TD to prove tech for the deliverables like R2 and R3. The short/medium range sead missions will be done via unmanned systems CATS variants, air launched LM variants there are plenty of scope.
Basically NGARM in its mission got multiple modes, you vary the engagement speed accordingly and the missile work in various ranges, 200km max when speed is low and 100-120km when quick engagement 2.2 mach speed. Hence its speed is variable at 0.8 mach to 2.2 mach for various range engagements.
First is target detection , you either detect the enemy radar asset via other means (drone/sat image/ground intel) or do it in a very risky direct probing mission on a jet. Either way you acquire the target and feed data to missile, release it , guide via datalink comm then let seeker do the job. Now do it over large range envelope 200km, you feed general area coordinates to missile, let it go slow and activate seeker in the target area for target acquisition, which is why NGARM can fetch out the target even if it has stopped emitting radiation, that ability is built in.
Other mission is a su30 baits the radar to radiate by probing which is very risky mission and chance of shot down. Once you detect and identify, need very quick engagement because target location is marked in the radar and need to kill it before it reacts to your presence so missile dashes at 2.2 mach high up and engage the target within short time, hence low 100-120km max engagement zone. if another offesive mission is on at the same time that missile will dodge this area if possible via early path planning.
IAF is likely to cut this 2nd short range engagement and use LM like harrop for such missions, instead of using a jet mission. This is practical choice. So if mission priority goes down, so would NGARM role and demand. Then your choice is whether use NGARM for a 200km engagement at slower speed or use R2 like store instead which is true standoff weapon. All while the upcoming LM variants like Sheshnag, NAL uav, Harrop etc are on incremental curve and offer more flexibility in terms of target detection , acquire and engagement all in 1 single package and in visual video feed means. This is how technology shape warfare i guess.