Abstraction is the most powerful and the most dangerous tool in your belt: you could build bridges over canyons or dig yourself into a hole.
Abstraction oftentimes comes with its evil brother complexity. You invite one to the party and both come. You need to have an eye on both.
We have to keep pragmatic.
The abstraction guide you to the real important thing, Design!
For me, in the Object oriented design, thanks to abstraction you can design the Business Logic with the Design Principles in mind, that's access you to better use of Interfaces or abstract classes.
At present, I work with people that just write code and create table in the databases. Those systems don't have design and maintenance is too hard.
I like the example about human body.
I want to see more about writing like this, besides being easy to understand this looks very interesting
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