Re: original devs
Somewhere about 1990 manuals started to explain in excessive detail anything that might be blindingly obvious - while omitting to explain anything that was complicated or hidden. At which point they became a bit useless.
As in a full explanation about how to use the on/off button, but not a word about how the switch works that somehow managed both to open one end of the dust collector and also release the other end from the device body for fuller cleaning.