Dear Always,
Your right that she is not an outsider. But at least initially, she is an outsider to his personal way of appreciating his own Torah. If she has her own perception of a learner, that makes kollel marriage double the work. And for no reason. She will not be a full time learner. Seminary makes sense for the girls that will continue to grow in Torah. But everybody and their uncle discourages new kollel wives from continuing their studies.