To be fair.. as a boy.. this is my time machine hitlist..
Deliver the metric standard to the united states. Worth noting, the reasons and story of how america stuck to imperial is pretty crazy. Politics as usual, but also ships lost at sea and pirates.
Regan
Roberson. He invented the square drive screw head, but wouldn't license it out, so it was eventually overtaken by phillips head screws. Due to this, humanity has been cursed to stipping screw heads and having drivers pop out for centuries.
Phillips was intentionally desinged to push the bit out of the screw to stop overtightening. The result is as it is pushed out, the driver will strip the screw head. This is fine if your worried about overtightening so much that you would rather have a stripped head than an overfightened screw.
The cost to benefit dont add up in my opinion.
Benefits - dont overtighten as easy.
Cost - stripped screws on tightening. Driver pops out while tightening. Driver pops out on loostening. Stripped screws on losstening seized/rusted screws.
I would much rather just not overtightening a square head than dealing with all the stripped screws. In either falise case, the only solution is a drilled out screw. I find stripped out screws to be much more common than broken screws due to overtightening in a ratio of probably 100:1.