Abstraction

Abstractions should generally fit the common-sense use-cases and "just work".

King of a different kind

If we will not endure a king as a political power, we should not endure a king over the production, transportation and sale of any of the necessities of life. If we would not submit to an emperor, we should not submit to an autocrat of trade with power to prevent competition and to fix the price of any commodity.
- Ohio Republican John Sherman said on the floor of Congress

Assumptions hold unlocked value

The harder we fight to hold on to a specific assumption, the more likely there is gold in letting go of them.
- John Seeley Brown