Where are all the jobs going? There are a lot of RF things going on at an ever increasing pace but I don't see a lot of people hiring in the field. Do all the defense primes just have a silo of gray beards they keep in a dungeon somewhere?
TLDR: To answer your question, to reduce the reliance on a relative few engineers, the market solved it with a few products that are 'just good enough'. This has become a self perpetuating cycle, race to the bottom. There will still be many analog/RF EEs but relegated to a few niche sub-industries serving mainly the DoD and RFIC industries. Even the telecom industry is planning to pipe back raw, downconverted baseband data to a central location to do SDR DSP rather than rely on a modem at the basestation. All for flexibility in lieu of power/efficiency, NRE etc.
I don't even know where to start on your "temporal dynamic range" comment....
This is the right idea, in many cases, the "HW" team might focus on RF but does "antennas to bits" (i hate that term) because of the need to get a prototype up and running to test it. If you have baseband circuit and DSP experience you could be poised for a lateral move especially since the operational frequency will be less critical for your skills. For example, without years of mmWave experience a move into doing mmWave RF wouldn't make sense but that doesn't mean you can't work on other parts of the mmWave system.
RF HW design is very much a systems engineering field and folks that have experience in each block are more desirable than ones that focus on only one piece in most cases.