I think the problems are: 1) If you try to optimize in the beginning, you tend to fall into the over-optimization/engineering camp; 2) If you just let things

I think the problems are: 1) If you try to optimize in the beginning, you tend to fall into the over-optimization/engineering camp; 2) If you just let things go organically, you tend to fall into the big messy camp; So the ideal way is to examine from time and time and re-architecture once the need arises. But few companies can afford that, unfortunately.