There is no shortage of fire if there is wood in the eight characters

Yes, if the wood is too strong, too hard, too much, and there is moisture, a weak fire will not burn. It's called "more wood, more fire and more sorrow" or "extinction"

In the eight characters, fire C is too weak, wood is too prosperous, and wood is too weak to be cremated, which is called dark fire.

Everything depends on the combination of eight characters. If the combination is good, it will not be dull. If the combination is not good, it will be easy to be dull without giving C a chance to play, which will lead to frustration.