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WW1 in a way was special, because you had modern weaponry with 19th century medicine (and arguably 19th century tactics - meaning an army that wasn't mechanized).

The fact that the war was effectively stalemate for 2ish years also contributed to both the medical issues involved and the psychological impact of combat too.

They did have fairly strong and comprehensive landline field phone networks, wireless wasn't really needed.

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The landline only work if you are standstill. As soon as you have open war, even just over 50m no-mans land, you were out of reach, you lose the connection and it takes a while to catch up.

Specially as artillery shells destroyed wires. So pulling a phone over a few 100m of no-mans land was not that hard, these places would be shelled when the counter-attack happens.

So yeah, in pure trench war-fare they had comms, but coordinating an ongoing attack is really what you can't do.

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