The KISS Design Principle - yes another little mental model to add to your cognitive toolkit - was first coined in the 1960s. Kelly Johnson a lead engineer at the Lockheed Skunk Works used the principle to approach complex projects.
Lockheed Skunk Works developed the S-71 Blackbird spy plane - I think I had it on a Top Trumps card once.
Johnson encouraged the design to consider how simple it would be to repair, with limited equipment in less than ideal scenarios.
This would be a useful challenge in how we design learning now. What happens when things stop working? Is it simple enough for parents and students to resolve themselves?
Alternatives and adjustments need to be easy to implement, when we have little control over the circumstances.