Mainly insurance and liability.
Likely introduced with good intent - make sure people know what they’re doing and are safe.
Like everything, just pushed the wrong way.
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My side valve Hilman Minx came with a full workshop manual, including illustrating all the jacking points and measurements to straighten the chassis and body if bent.
Cheers
Some years ago I was party to watching a very competent hydraulic excavator operator about to be "tested" by a very pompous (Govt.) Dept Inspector. The Operator very calmly dismounted from the cabin, handed the keys to the Inspector, and told him to firstly show us how it should be done. To his credit, the Inspector handed the keys back to the Operator and said "Pass". Was the best way to defuse a potential embarrassing situation for the Inspector.
And a code reader if the vehicle or machine is full of electronic crap,which most modern ones are.[bigsad][biggrin]
Surprisingly the late model vehicle under our carport has a few tools in the OEM tool kit,apart from wheel brace,jack handles,etc.
Reading the vehicles handbook,i have worked out one is a screwdriver type device that goes into a small slot in the center console, to get the vehicle out of park if the battery is flat.
The same tool,using another slot, opens the rear upper taigate,from inside, in the event it has a broken lock or the vehicles battery is flat.
Are you forgetting what those old ones with tool kits did?
Very regularly that tool kit was out being used!
The damn things hated hot weather mostly, especially hills….
They played up regularly.
All that “electronic crap” actually makes vehicles inherently reliable. When they fault it can be frustrating for sure, however it’s significantly less likely.
While they are far more complicated with little that can be done without the computer the operator has little to do maintenance wise.
The old weekly and monthly maintenance is a thing of history spoken about by a few who can still remember how it used to be