The cabling has one chance to go into the walls correctly.
Connections made during the finishing phase are also critical to data rate capability.
Applications in the home today are not all that demanding, so performance shortfalls may not show-up until years later, as more demanding applications come along. As a result, the installers who do residential work tend to be a different group. On average, they have much less knowledge of the full range of communications cabling products available to choose from. Their design capabilities are hence much more limited. Builders looking for a competent cable installer will have trouble finding one who knows what he is doing.