In my military training for the communications troops more than 35 years ago, we were drilled to "Think, Push, Breathe, Talk", because analog equipment has warm

In my military training for the communications troops more than 35 years ago, we were drilled to "Think, Push, Breathe, Talk", because analog equipment has warmup latency, and besides, one would easily tend to unconsciously talk already while pushing the talk button. If anything, it would be EASIER for digital equipment to work around this, analogous to how shutter buttons in digital cameras work: Run the microphone in always on mode and keep a short ring buffer of the audio prior to the button push.