Dilithium is only found in certain stars, if there is dilithium, represented by the elongated hexagon near the star on the system display, you have to build a Dilithium Refinery. and power it. On small maps it is possible that there is only 6 systems with Dilithium on it. Giving which ever empire gets there first a distinct advantage.
Drawbacks with BOTF: the combat program was not stable, the Ferengi AI is broken, and the Borg are TOO unstoppable, they often decide the game because the AI can't handle them. They don't know how to assemble a multi-racial taskforce to handle it. The Ferengi with the broken AI is probably the only AI that can handle ONE Cube.