My college sent me as a missionary to Canton, Massachusetts, where I worked very hard and was blessed by God. But I didn't learn anything. That's because my college picked a church that believed and practiced exactly what my college believed and practiced. But in real life, Christian missionaries find themselves in situations they have not been trained for.
Different dress standards and music standards are only the beginning of the problems that occur when a missionary is on the field. Christians from different backgrounds have different attitudes and outlooks, and a missionary has to know how to deal with them. Unfortunately, colleges do not train their students to deal with different outlooks.
Separated Christians find themselves working with unsaved people in various ministries. People who donate large amounts of money have far too much authority in many ministries. Family members are often favored, leaders are often stressed-out, and some of the workers have no business at all being there.
A good, solid Bible college won't have those problems. Unfortunately, good solid Bible colleges can't give their students practical experience in dealing with them.