Capabilities & Limitations of evolved systems that work in conjunction of one another.
Stealth means not seen, counter to stealth is Speed and Maneuver to avoid Air Defenses…
Flying Low and Fast makes it harder for High Flying Inceptors to see also… They lower they fly, the harder for all RADARs to pick up, stealth by ground clutter.
Flying fast and low also helps defeat MANPADS and other SHORAD or HIMAD systems.
Nuclear & Conventional ordnance capable for tactical or strategic strikes
https://infogalactic.com/info/Rockwell_B-1_Lancer