I'll start with an illustration. Let say you need to design a room and you have no restrictions about size, furniture and budget. It will be pretty hard to design the best room you can sice many variables can be altered. Or it will take a lot of time.
For example, you might be required to increase the room size during the design process to make a specific piece a furniture fit it which will impact the position of other furniture.
But if right at the beginning, you have a restriction of room size and budget, then it is much more easier to design because you know your limits. So you will be able to maximize the interior space of the room to it's full potential which would not necessarily be done if you could simply make the room bigger.
That situation could be transposed to board game design. Yesterday, I had the idea of make a pocket version of a pacific WW2 game. The restriction is that it must fit on a small board the size of a letter page where there will be around 25 hex on the pacific map. There must also be a minimal use of components (I am using dice and cubes so far) and the game must not last more than an hour.
At first, I thought that it would make a very simple game with lack of depth and details, but I realised that many details/features like Weather, Pinning, Supply Routes, could be implemented even in a very small game.
So it's like if I am optimizing every inch of space I have. I get a similar feeling when designing variants, because, again, you are restricted to use the components supplied with the game.
I don't know if this technique could be useful for everybody, but I seem to design more efficiently when bound within restrictions.
I made a mirror thread here:
http://www.bgdf.com/node/6859
Any suggestions on what kind of restriction can be setup, I was thinking of:
Components: Type, Size and Quantity
Game Stats: Nb of players, Play time, etc.
Mechanics: ex: must be a deck building game, must not use dices, etc.