Wouldn’t a modern computer on a jet, let’s say F-35, give you an accuracy of give or take 100-300 meters for a dumb bomb? It kind of doesn’t make sense with a nuclear bomb to be 1m on target…

I am guessing, but wouldn’t a JADAM kit also improve the range? You could probably loft it further I suppose. Perhaps it isn’t to give it pinpoint accuracy as much as it is just to keep the launching aircraft out of the S-300 envelope. The Russians ARE claiming to have an anti-stealth capability with their newest SAMS. Not addressing the SAM threat would compromise the deterrent capability, even with Stealth aircraft. 20 miles range may not cut it though. Ruskies can reach out and touch you from a lot further than that.