Supersonic also leads to heating, which leads to other problems, especially having a very detectable IR signature.
Stealth and persistence requirements pretty much result in a LO, subsonic design. A supersonic, stealthy platform would be much more expensive.
Fuel consumption rate is the main drawback of supersonic designs.
For example SR-71 was designed around speed not around concealing IR signature, low observability or fuel efficiency and even if those things were weighted they were traded in favor of even greater speed.
In the past there were suggestions that the budget for the B2 was too big for one aircraft and that it was actually funding 2 programmes.
If you apply that logic here, then one aircraft is the deterrent (with top quality LO and endurance but more overt when it comes to readying it for battle). But the business of getting the job done suddenly and without warning could be done by something else.
That sounds like taxpayer comfort, Cold War era money pits like B-2 contributed to Aurora’s legend but in today’s world it’s quite hard to justify a project of that magnitude to fight an imaginary enemy. Obviously budget nonsense is going to continue until the last turn of printing merry-go-round.
The fastest and cleanest way of getting the job done are conventional ICBMs but unless one advocates for their proliferation they’re not an option.
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