Sure, nobody is suggesting bombing Beijing on day 1. But after Chinese AWACS have been shot down, deep penetration bombing missions become possible. Long range weapons such as hypersonic missiles and anti-AWACS missiles are good for knocking the air defence door down, but heavy hitters like the SU-30MKI and Rafale become useful afterwards.
An interesting fact: The distance from Guwahati, Assam to Taipei, Taiwan is under 3000 km.
You are still missing
Chinese Combat Air Patrols, which would be effective even after Chinese AWACS are shot down. India has relied on CAP for air defence through much of its history. Its only now that we are getting Medium and Long range Air Defence systems.
Moreover, these types of missions can only be carried out by IAF after they reach 42 squadron strength (by their own admission). We don't have the fighter strength to conduct a primarily offensive air campaign against China.
Our Air Campaign will be offensive-defence ('cause purely defensive air campaigns are bound to fail). Since our Air Campaign is offensive-defence, our
Air Interdiction effort should be on targets of immediate concern. And there is no shortage of such targets. Targets deep in China hold little value here.
I get that India has a new stand-off capability and we are all very excited about it. But we need to stay on the practical side of things. Even now we would be
hard pressed to target Golmud, forget Beijing. Its better to use this new capability primarily to target Chinese ships in IOR, especially Lombok and Sunda straits. And if we need to use it to use it on Northern Front, using it to
target Hotan along unexpected axes of attack.
As an aside, personally, I would much rather see Strategic Bombers as our heavy hitters. But we are gareeb right now. Should be possible post-2040, but not now.