⓵ 주제문 -> The whole point of my answer is that it is better for universities to require students to specialize in one subject.
⓶ 뒷받침 문장 1 -> It is a more sensible decision that universities require students to specialize in one subject.
⓷ 뒷받침 문장 2 -> It does not mean that students have not too many classes to attend even if they just specialize one subject.
⓸ 마무리 문장 -> In the whole, I thought that universities could allow students to take subjects as many as possible
if their times and energies were available.