That's true, but the design constraints are very different. If your synth had a system in it that could fail, and another system responsible for monitoring that first system, and potentially overriding it, and if that system failure required you to take immediate and very specific action to prevent your synth from turning into a fireball, you'd want probably want a more or less one-to-one mapping between those subsystems and the instrumentation that you're looking at.

The well-loved classics you describe sound more like making a plane that's aerodynamically hard to lose control of... which is kind of a holy grail, but the MCAS design came after all of that was fixed by earlier design decisions.