Re: The future is behind you ....
It seems you don't understand what SDR is.
In practice mobile phones use it.
SDR produces the baseband signal via a DAC which, in the case of mobile that i was involved with, there is a device known as the RFIC whose output chain is composed of primarily a DAC, RF oscillator and the mixer to modulate the carrier.
An external RF power amplifier and filters complete the transmit chain.