The answer is that to communicate human speech, a wider bandwidth is required than that of the CW signal. With a smaller bandwidth the 'signal to noise ratio' of the receiver is significantly improved, and the threshold at which signals can still be received above the noise level is therefore extended. Also, it is possible for the human ear to be able to resolve CW signals which are only marginally above the noise level, whereas SSB signals of the same signal level could not be copied. It has been suggested that CW has an advantage of approximately 20dB over SSB signals. A narrow bandpass filter improves the CW reception.
Many newcomers seek exemption from 'tiresome' Morse test for Short wave operation.
This is unfortunate as the Morse code is the key to enter into the world of ham radio with little monetary investment. A novice can assemble a simple Morse code transmitter with lesser technical hurdles than that of a SSB Voice transmitter. Morse code can be learnt easily if we use certain techniques to remember the codes. Learning the Morse code is also a personal venture embarked upon by alone. Similarly, the letters A, U, V and the character 4 can be made into a group which shows a definite sequence.