Re: Why analog
Well you have to use ADCs and DACs (mixed-signal circuits) in circuits that interface with real life signals...you also have to use analog Amplifiers (and more specific types of amplifiers like the LNAs - Low Noise Amplifiers).....then there are analog filters (digital filters can't work at very high frequencies, b/c we don't have ADC/DACs available that can operate at such high frequencies)
Also most of the communication electronics work is based on Analog circuits....b/c you can't directly transmit digital signals from an antenna without modulation....
thus most of the design work concerned if you're designing ADCs, DACs, amplifiers, LNAs, filters, modulators, demodulators, mixers is based on Analog circuits....
Analog designers are much lesser in number than digital designers....b/c analog design is much more difficult...there are many more parameters to take into consideration while doing analog design as opposed to digital designs....that's why they also get paid higher!
Whereas digital designer's work is a lot easier...that has been made even more easy b/c of the evolution of so many tools geared towards the digital designer...you can design complete Microprocessors in an HDL like Verilog and burn it on an FPGA chip or give the computer generated layout to an IC fab....while this type of tools have not been developed for analog design...