Why is Equality of Opportunity controversial?

Beyond technical arguments, the most important critique of equality of opportunity is that it makes no comment for the distribution of economic wealth, only its potential. In equality of opportunity, it is perfectly acceptable for things such as poverty, for example, to exist because, so long as everyone has equal opportunity for making a living, then it is their fault for not accessing it. Whether such equality truly exists is controversial, but many people feel a normative opposition to it.