Why YAGNI principle

What is YAGNI

YAGNI, or "You Ain't Gonna Need It" (or "You Aren't Gonna Need It"),

Why YAGNI

• What you guess nessessary is not necessary in high probability.
• There are always many things to implement which is actually necessary before you implment what you guess necessary
• The more code, the more time others spend to understand
• Every values will be reducted by probability of being used
• Everything cost you have spent can turn out to be wasted in vein
• Life time every menmber has spent on can turn out to be wasted in vein