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At one time low altitude was the best way to evade air defense as fighters didn't have look down/shoot down radar capability. They do now, so the low altitude mission might help with ground based radar (by using the earth and geographic features to hide), but an enemy with modern fighters and AWACS capability makes this profile difficult.

When computers sucked and there were a lot fewer smart bombs/missles, flying low gave you extra accuracy, but now that modern bombs include gps, IR, and probably 6 other tracking technologies it's a lot less useful.

> What's the benefit of low-altitude capabilities for these bombers?

You can hide from radar under the horizon and within terrain. (Mostly the former. Flying wings aren’t optimised for manoeuvrability.)

Terrain following significantly decreases detection range.

Not being shot down by longer-range surface to air missiles.