Gives away the stealth if external storage is used. Besides the whole discussion about bombers in modern time is subject to affordability. No other nation operates a dedicated bomber force in large numbers apart from the US. Besides with the advent of JDAMs, the argument of collateral goes out of the window. A JDAM costs 35,000 whereas a Tomahawk costs 600,000 each to deliver the same 1000lb of Payload. A B 2 can carry 80 500lb bombs which give it the option of bombing multiple targets. Use of ballistic missile like trident would not make sense in a conventional bombing scenario. So if you can afford one, you can maintain a fleet of dedicated bombers. If not look for multi-role fighters.