The WS18 was ubique though, used in all theatres of war. Because the xmtr/rcvr are independant units only the faulty unit had to be replaced. This was done by loosening one screw on the back. The SCR300 was a more complicated set.
The WS18 did have it's issues. The WS58 was intended to replace it but never happened. The WS46 came to be the set du jour.
What we also see is the focus of schools of development. The British spent their resources on low freqency HF AM/CW sets. The US also had these sets with the BC611, GRC9, etc. They were quick to move to low band VHF FM.
The SCR300 was friendly in that anyone could talk on it. The WS18 needed someone trained in CW to use that mode. Mind you FM has it's limits as well. It wasn't very good for weak signal work because of the nature of FM & the squelch circuit. Weak signal CW could often get through.
By the end of the war it was clear that infantry sets were moving to FM.
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