As many others have pointed out, bombers are not on paper special in any way as far as the triangle is concerned. The problem with bombers is that they cripple so many "key" defenses.
For the AI defending against "just" bombers, it is not a problem because typically there is a fleet of some sort to counter the bombers. In addition, if the human attempts AI manuevers and suicide runs against a command station, the AI at worst just shrugs it off due to the AIP increase. This in itself is perfectly fine, in fact I am tempted to say it should be this way.
Humans DO have defenses against bombers. Tractors beams work wonderfully, and bombers are pretty weak at attacking turrets. Only through brute force does the AI beat them down. Defense in depth also works: if you can emulate AI tactics and shrug off the lost of the planet while your own fleet chews them up then that is also brutally effective. A well placed EMP warhead followed by your own counter fleet (or even a lightning warhead!) takes the wind of any wave attack. With these new patch updates, your own fighters will be able to chew through bombers even faster as well. I myself dread seeing "bombers" during my wave counter, but that is simply because I have to think outside of the box instead of just having my defenses chew through them automatically.
Perhaps it is odd that one unit is both THE counter for forts, forcefields, golems, starships, and command stations...maybe. But said unit is also weak against fleets and turrets. The game needs units to counter these powerful forces, but perhaps it shouldn't come from one single unit?