一道GMAT语法题，关于 equipped to do 和 equipped for doing

Question

这是正确选项Combining enormous physical strength with higher intelligence, the Neanderthals appear to have been equipped to face any obstacle the environment could put in their path....
这是错误选项 Combining enormous physical strength with higher intelligence, the Neanderthals appear to have been equipped for facing any obstacle the environment could put in their path.....
答案解释里说，这里不能用 for 引导的介词短语代替 不定式，请问为什么。 equipped to do 和 equipped for doing 不是都有准备好做某事的意思吗

Answer 1

这是美语用法，equip（使……有能力、有资格）sb to do sth

equip（配备） sb/sth (with sth) for ……，for 某种目的本回答被提问者和网友采纳

Answer 2

表示目的用equipped to do，一般equipped for 后面大多数跟名词，不表示目的