It is in every engineer to write the gold plated car, as it is in marketing and sales to always need the future tomorrow to gain competitive edge.
The number of times I wrote beautiful code are quite numerous, the number of times it is still not used to its potential as well. In the end I spent too much time over engineering for a disastrous moment or extension that never happened, or was never requested by a customer.
I have written godforsaken shortcuts that are used so frequently it made me feel proud and ashamed at the same time.
Now, I have come to believe that knowing when to stop is the greatest skill of all.