[dkrikun]

This is a good advice, but I feel to add a few points of mine:

1. the author says "premature optmization", and it has the right context, however I prefer to use "premature abstraction" or even "speculative generalization".

2. YAGNI and DRY can be counter-principles because at times "you aint gonna need that level of abstraction/genericity".

3. Inadequately abstract and generic code hurts simplicity and readability.