I agree with this, emphasizing the analogy to WWI capital ships, rather than taking the implication that few and difficult to replace assets would never be used as other responses seem to.
Dreadnought types didn’t go totally unused in WWI, but there was a manifest reluctance to put them at great risk, because they were so valuable and difficult to replace. For example the Germans sacked their fleet commander von Ingenohl basically for losing one semi-battle cruiser (at Dogger Bank in 1915) after a mainly shadow boxing campaign v the RN, followed by a leader von Pohl who wouldn’t risk the fleet at all, then working their way up to a series of bolder operations under Scheer which resulted in one large but inconclusive battle, Jutland, and basically nothing after that (not counting Baltic operations against a Russian fleet which its leaders wouldn’t risk…). And the Germans were not in general irresolute in war in the 20th century.
I think it follows pretty directly actually from the cost/irreplaceability of B-2’s (carriers, etc also) there’d be similar risk aversion in their use, relative to those platforms’ vulnerabilities. As long as the risk is low, sure they’d be used, again as German dreadnoughts were in the Baltic after Jutland. Against top Russian or Chinese defenses which may have gained a realistic capability against them, I doubt B-2’s would be used aggressively, or for long after any losses.
Or to put it in terms of another historical analogy, unlikely IMO B-2’s be used against defenses expected to have capabilities against them similar to what the S-75 (aka Sa-2) system did v B-52’s over North Vietnam, inflict 2% per sortie losses. Of course they’d be used if the relative threat to them was what faced B-52’s over South Vietnam (essentially none), or even perhaps over Laos and the NV panhandle (where they might come within range of S-75 and one B-52 was eventually lost to them in spring 1972, prior to the campaign in the Hanoi/Haiphong area at the end of that year).
Again I think this is obvious once everyone is on the same page as to the meaning of the original statement. The B-52 was long out of production in 1972 but there was a surplus of them relative to the strategic nuclear mission. There’s no surplus of B-2’s. A chance loss here or there wouldn’t be a disaster, a series of them would be, unless a very decisive result could be achieved first (as in nuclear*, but I assume we’re speaking of conventional use). And it’s totally different from exposing B-17’s and B-24’s to constant losses for years, where 2% loss rate was favorable: there were 1,000’s of new ones coming off production lines.
Nor IMO should it get into a technical discussion of the B-2’s capabilities v air defenses because the capabilities of future defenses aren’t known, even current ones not certain.
*and another aspect with strategic bomber losses in conventional operations is the possibility of undermining their deterrent threat in nuclear conflict. This arose with heavy B-29 losses to Mig-15’s in some daylight raids over North Korea in 1951 for example, among the concerns besides the losses themselves, even though the B-29 wasn’t the main nuclear bomber anymore.