"K čemu jsou ve válce znalosti pravopisu?"

Translation: What use is knowledge of spelling in the war?

[Krylus]

War is what happens when language fails.
Margaret Atwood

[PierreMDL]

Well I can't say you don't have a point here, but still...

[Praha2017]

I reported some seemingly missing sentences but maybe I was wrong. Could you please clarify:
Do those sentences have different meanings:

'K čemu je ...?' – 'What use is ...?'

'K čemu je dobré …? – 'What is … good for?'

Are these constructions not interchangeable?

[Marks797148]

What about: "What is the use of knowledge of spelling in war?"

[VladaFu]

Literally that is "Jaké je využití pravopisu ve válce?" You are using "the use" as a noun here and Czech does have an equivalent noun. However, the original sentence is a bit different.

[BoneheadBass]

Hmm... should I delete those versions? (I think my recent changes only made the articles optional; the "what is the use" group may have already been there.)

[BoneheadBass]

"What is the use of knowledge of spelling in war?" is accepted.

[Yukohn]

Why "What is the use of spelling knowledge in war?" is incorrect?