This story is based on real life events. A small company I was working for was bought-out by another small, but out-of-state electronics company. The new owners were well versed in bit-banging and CPU. My former company was 99% analog. We used op amps and R/C circuits for timing/filtering. They used code on CPU's. The new owners flew me out to their facility on three different weeks, to help their staff incorporate this whole new product line into theirs.
One interesting discussion I had with them involved creating a 0.5 second power-on reset signal for a USB interface chip, to allow the rest of the unit to "settle" before bringing up the USB interface. One guy said he'd just use a little 8-pin CPU and some code. I suggested an op-amp, some resistors, and a cap. They looked at me like I had two heads.
I reminded them that because these devices were intended to be used in environments with high levels of radio frequency energy, and high sensitivity receivers, (transceivers) RFI ingress and egress were important! The op amp and R/C circuits were virtually RF immune, and generated NONE. A CPU generates some, and is sensitive to RF.
Case-in-point: They had a high-current, DC switching system (multiple DC power ports that could be controlled remotely) that was driving them completely bonkers, because of random resets or other unpredictable behavior when they switched loads on and off. When I tried to explain current loops and grounding, they again looked at me like I had two heads. One even said, "But isn't ground, just GROUND??" (Insert FACEPALM here!)
I had to briefly explain OHM'S LAW to them! Ground planes have a measurable (albeit small) resistance, and when you are passing a dozen amps or more, you start to see dozens of millivolts from the E=IR drops... sometimes, switching spikes were high enough to false-trigger CPU inputs or other circuits, because the CPU was "riding" up and down on those voltages! When I showed them one of our old ANALOG designs, with separated ground paths... and explained WHY those paths were separate... I think they finally "got it". Their next complete redesign didn't have the issues of the first.
I summed it up by saying, "It is an ANALOG WORLD, guys!" ;)