Hello, you would probably need one of the defence professionals on here to give a definative answer, but my amateur crack at it would be as follows.
During the cold war , the Nato forces in europe, had the Warsaw pac attacked would have faced a massive onslaught and the land forces would have fought a retreat to various choke points and bottle necks. The RAF germany and all the other NATO airforces would have supported the ground forces and faced a numerically superior force, and loses would have been phenomenal, with the spectre of a nuclear exchange and escalation being the unthinkable consequence. The airforces had to find a way to ground or destroy as much soviet airpower as possible, blow up bridges, supply lines, tank formations etc. Destroying runways was obviously of critical importance.
Soviet anti aircraft technology, if lacking the technical edge over western systems made up for it in sheer numbers, multi layered systems in huge numbers, much of it mobile enough to advance with the armies, the SAM umbrella being a particularly tough nut. Now in Vietnam , the north used soviet systems and inflicted heavy casualties on US forces, the US forces in turn spending a massive amount of resources to counter it, jamming, hard kill (anti radar missiles) and a combination of flying through it with countermeasures or under it at low level, where aircraft are at risk from old fashioned triple-A.
The USA has far more resources that anyone else and so the approach of the US may not be one for other mere mortals. The UK can not, or could not afford enough electronic warfare aircraft or offensive assets to base its strategy on nullifying an air defence network and operating at altitudes other than low level. Low level obviously means you avoid detection until the last minute. There would be two ways to take out an airfield. Gain air superiority over the fighters, jam the radars or kill the radars with missiles, then fly safely over the AAA and put a precision weapon on the runway to ground all air ops, now that takes a lot of aircraft, far more than the RAF could achieve in germany, where they faced literally hundreds of warpac airfields and dispersal sites. So the RAF solution was a weapon the JP233, which required the tornado to fly down the length of the runway , the cannisters spewing out sub munitions to break up the tarmac and delayed fused mines to stop repairs, the aim to ground as many warpac aircraft for as long as possible so NATO ground and air forces could operate unhindered. I believe the germans developed a similar system for their tornados and the french a rocket called durandell that fired downwards into the tarmac.
So the gulf war was fought with 1970 and 1980s technlogy on the whole, meaning technology aimed at defeating soviet cold war tactics and technology. The Iraqi air defence network was probably less dense than the soviet one, but based on its philosophy.
The context of the gulf war was one where saddam had used chemical weapons, had means to deliver them, had threatened to use them and it was believed he would use them. He also had many many airfields. The target list was vast and the real fear of what Saddam might do, meant that a lot of targets needed hitting and quickly.
The hindsight argument is that the RAF didn't really need to practice low level runway denial, that somehow it was a futile effort of flawed tactics. But in 1991, The RAF had a suitable weapon, it had a key role in the planning phase of war and had practiced for decades against soviet built weaponry. Maybe the US could have taken out all the airfields without UK help? But at the time the RAF stepped up and took on a particularly tough job and lost men.
Penny pinching politicians and vested interests have reduced much of the debate around defence in the UK to petty arguments between services, Unfortunately some with an axe to grind against the RAF such as Sharkey Ward have seen fit to apply hindsight to a 20 year old war and decry the efforts of a lot of courageous men. If the bile was aimed at the politicians all three services might get a better deal.
Any way thats my potted history, feel free to correct any errors