Even without the hand holding of expensive, sophisticated simulation software, you can design an analog IC. Let's proceed.
Some classics have their time and then fade, but others are still with us; the analog peak detector is still going strong.
Data transmission that is done per the RS485 convention can be accomplished without a ground or circuit-common connection. The RS485 transmitters and receivers will tolerate significant differences in ground potential.
Can engineers adapt to different markets? After working in one field for a number of years, how successful would you be jumping to another field?
Two well-known tech companies had a special way of doing things that allowed them to produce excellent products. Over the past few decades, we've moved away and followed a different path. Can we change and try an approach that mimics these past successes?