You need tiers of capability. Nukes are one, but a more readily used one is the ability to knock out (or at least suppress) ground based air defense. Stealth aircraft like the F-35 are perfect for this mission, they can get in range, fire off an anti-radiation missile, and get out. Non-stealth aircraft may be forced to turn back before they get their shot off, thus leaving the enemy air-defense active and forcing a scrub of the planned attack on what the air defense was defending.
You need tiers of capability. Nukes are one, but a more readily used one is the ability to knock out (or at least suppress) ground based air defense. Stealth aircraft like the F-35 are perfect for this mission, they can get in range, fire off an anti-radiation missile, and get out. Non-stealth aircraft may be forced to turn back before they get their shot off, thus leaving the enemy air-defense active and forcing a scrub of the planned attack on what the air defense was defending.