There are ways of achieving lower frequencies with SDRs, for example the older model of BladeRF has an expansion card that goes down to 60Khz. There are tons o

There are ways of achieving lower frequencies with SDRs, for example the older model of BladeRF has an expansion card that goes down to 60Khz. There are tons of things you could transmit, for example GSM, DVB, ATSC, GPS, amateur digital modes, the list goes on. Voice/CW aren't really what SDRs are for, just like personal computers aren't merely a replacement for typewriters. If all you want to do is voice/CW, then yes, you should just buy a Kenwood or Yaesu. You can do the same things with an SDR, but that's not the point of them.