A bomber and a tanker/airlifter a fundamentally different aircraft, which is why purpose built, optimized machines of either variety look fundamentally different from each other. And while the tanker and cargo types can generally be unified in a single airframe (although something like an A330 MRTT cannot even hope to haul as much as a C-17), that's far more difficult with regards to bombers. Tankers and cargo aircraft are expected to operate either far away from the contact line or operate in completely controlled air space. Now, one might say "isn't that the case for a bomber that's not stealth as well?" and I would say that to a degree yes but mostly no. Bombers have very powerful ECM suites, they operate very differenty from tankers and airlifters and do go to great lengths to increase their survivability through various countermeasures. They're optimized for endurance, range and launch performance. Now something like a large BWB aircraft could lend itself to all three of these classes, but it would need to be designed as a bomber first, as it's by far the most specialized of the bunch. And generally speaking attributes that make a good bomber don't always translate well into being a good tanker or cargo aircraft.
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