Why bomber airframes can support many roles

How many roles can a bomber airframe such as the Tu-16 or Swordfish fill?

Potentially many, because its capacity to carry weight over distance can support other equipment if the changes preserve workable flight characteristics.

Bombers such as the Tu-16 and Fairey Swordfish are designed to carry substantial weight over distance. That payload allowance can instead support equipment for other missions. The airframe can therefore accommodate many roles. Alterations must preserve workable flight characteristics rather than using the carrying capacity without regard to the aircraft's behaviour.