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Some apps are a joy to use out the box, their UI's are so intuitive that one needn't refer to the manual at all.

Most non PC Power users only use a fraction of a apps capability and hence don't read the instructions first, they'll just go with the defaults and refer to the instructions when it doesn't "do something", I'm guilty of that.

All of my lady friends DO NOT read instructions for anything, if they're stuck they ask how they can do xyz, All of my male friends only know enough about a app to ensure productivity.

Notice how folks just get into a new car and turn the key or nowadays push "start" and go. Not one of my male or female friends have studied the warning annunciators in the instrument panel and are clueless as to the meaning and implication of most of the warnings, e.g. when the key is annunciated in the panel it means that either the cars battery, or the battery in the keyless key is going flat, a friend discovered the meaning to that annunciation at a most inopportune moment.

A lady friend had no idea that her cars, key-less key, could remain buried in the depths of her "always purse", that it wasn't necessary to use it to open the boot, drivers door and start/stop the engine, also that the car would auto lock if she walked away from it with her handbag, when this feature was demonstrated to her she fell in love with her car, really.

And don't get me started on microwave ovens, I sometimes wonder what the OEM ergonomic think tanks are paid for.