Since some are mentioning historical background to support their point of view...
Well it had a reason why they didn't repeat the Dambuster thing too frequently. It was a highly risk operation for very little effect as it seemed at the time since the german economy prooved to keep on running steadily even under the hardest circum stances. Like the constant bombardment of england by the germans in the Blitz seemed to couldn't remotely stop the british war efforts, too. Airpower just hadn't the same importance and effect back then like it has today (on the cost of a very expensive developed air force as you can see in the todays USAF, doubtful if the millions and billions of dollars justify the means...), so it is actually a flaw of this game that we can even capture fields... Anybody who have read Stephen E. Ambrose's and/or seen the movie/mini-series of Band of Brothers sure knows that a single goon (which actually could carry up to 28 paratroopers) is nothing more than a good laugh for the defending ground forces (operation market garden: 10,000 airbourne british forces went for Arnheim but only 2,000 returned). But it would be boring to let the GI Joes' do all the job and just circle above them and watch, wouldn't it?
Back then they didn't even needed radars to get some reconnaisance information about enemy air action to the boys flying arround. While fighting against the germans desperately in the early days of the war in greece the british had no working radar system in the region. They held up by another simple method: several people were sitting and watching the sky all over greece, every one of them equipped with a phone and noted down with a number as designation and exact position on a map in the HQ. Now if one of them saw enemy actions in the sky they phoned the HQ said their designation and what they saw (type and number of enemy aircraft, in case of clouds prohibiting visual they just reported "very loud engine noise" or "some engine noise") and in which direction it was heading. The fellows in the HQ took a look on the map to locate the "station" of the report and noted down the time. By simple calculations of how long it took for two watching posts to sight the same bomber formation and knowing the usual cruising speed of the german bombers they were sometimes even able to give some information about the estimated altitude of the enemy. That was the early warning system for the british forces over greece and creta. They also used a similar system during the BoB to get information about the enemy types of aircrafts, number and altitude (they had some complicated optical equipment working on a triangular basis) to the HQ, some days it worked also well as backup system for the constantly bombed radar stations. Now imagine yourselfs being either too young, old or the wrong gender to fight in the war, though determined to help sitting arround watching the sky 24/7 just to make a phone call of a couple of minutes once in a while and occasionally getting a very short "thanks" as reply. Yeah, most heros of the war never got the proper attention...
However all these nice radar systems ain't helping if the HQ where the radar reports of all over one region ran together to get transmitted to the pilots gets knocked out. So it may not be historical that all the radar for the whole map gets knocked out by one bomb, but if your only inflight source (HQ) for getting relayed radar information disappears it have the same effect for you as simple pilot at least. Back then in reality they had a lot longer to wait for some temporary formed HQ to take over this job than the rebuild takes in AH. Anyways historically they hadn't these precise highlighted in red icon colour symbols on the map giving away the exact location of the enemy HQ (which of course was classified information in most regions except maybe in London and Berlin
) which was relaying all these vital radar information to the boys inflight. I think the british HQ for the radar information and Fighter movements (Uhm not sure if it was located in whitehall but I think so...) was hit once during the BoB and didn't got many fatalaties but just one heck of a shake-up as you can see in the movie. Of course a bit after the start of the blitz they had started using these balloons towed with steel cables to the earth and with a lot of explosives hanging under them blowing away any low altitude assault over London... Like some englishs were joking: If all these hundreds of balloons over London would have gone it would have seemed it was most likely for the city to sink in the sea.
So as you might see you can find examples in history to support both sides of this discussion...
My 0.02 Euro on historical background as far as I can remember...
