We Should Reinvent the Wheel!

It has been already done. Why do you want to reinvent the wheel?
Why did Google reinvent the search engine when it was already invented by Yahoo! and likes?
What was the need to keep reinventing the first wheel humans made in primitive times?
Because someone has already done it, am I wasting my time doing it again? My way?
Innovation
--> Necessity is the mother of invention.
--> Change is the only constant.
--> Different times, different needs.
--> We can always do better.
--> It is human to invent and reinvent.
Reinventing the wheel is evolution.
If I have to believe Darwin's Theory of Evolution, nature has constantly reinvented herself, and will continue to do so. If I am a product of evolution, I will also continue to reinvent. Hate me if you don't like me.
Why do your thoughts keep changing? Aren't you supposed to have been created and finished once for all?
If we never reinvented, for example, we would still have the age-old mechanical computers or vaccum tube computers which would stop working every few minutes because some screw came off or some tube got fried.
So you mean that we have achieved perfection? No scope for further improvement?