And how can you NOT have time to intercept? I mean, what are you flying that takes over 20 minutes to get to 20K?
Heavy buffs at max level speed roughly cover 25 miles (1 sector) in 5 1/2 minutes.
A 109K4 can do the same, but including taking off from sea level and climbing to 10k. If just climbing, the 109 will be past 20K after the same time.
Heavy bomber level speeds may be unrealistic, but so is the fighter pilots ability to be back at the bombers after a few mins when being shot down by them. A bomber pilot being shot down is no more threat for a long time.
Having formations is important for game balance. Removing formations makes them even more dead meat than they are now, and the few very dedicated bomber players will invariably tend to cruise at even higher altitudes, 25-30k bombers would probably the norm, not the exception.
Unless bombers fly at 20k+ they are easy to catch and to kill, in almost any plane. It's simply not true that fighters can't keep up or overtake them, only ha few EW planes have such problems. (Though I killed 999000 in a Hurri I once... a day to remember

)

The only real problem is, as already pointed out in this thread, the lack of patience. It's amazing how people can spend 5mins to climb up to a bomber, and then are too impatient to spend another minute or two to gain a favorable attack position.
A very common sight in the MA: A bomber formation at 10k, followed by a trail of greedy fighters creeping up at their 6. One after one goes down in flames, and the whining about "friggin lazer guns" starts. It's just the same as flying right head-on into an enemy 110's gun arc, and then complaining about "lame HO's".
It's sure, not everybody will reach 10-1 KDs versus buffs, but
everybody could get a very favorable K/D against them if flying just with a bit more brain

I do occasionally fly buffs myself, and only a small percentage of fighters care to get into a good attacking position. Those that do usually kill me, even when not being one of that "1337" pilots.
And yes, even with proper tactics a victory over that buffs is never guaranteed...but frankly, why are you looking for guaranteed kills? Why should someone fly buffs when they are completely helpless?
And keep in mind that the majority of buff pilots are new / inexperienced players, one common road of progression in this game is to jump into a fighter first, die a lot, and then flying bombers for a long time until feeling comfortable with the game and trying fighters again
