Most families use all four and rarely decide the proportions on purpose. The order they are drawn on changes the total cost of the degree considerably.
The four year degree is treated as the safe choice and the thing to do while undecided. It is a large commitment and it deserves to be chosen rather than defaulted into.
The difference between records that make a return straightforward and records that cost a weekend is not effort. It is entirely a question of when the effort happens.
Most questions families get stuck on about school have somebody whose actual job is answering them. The difficulty is knowing which person, and how to ask.
The protection is real, considerably narrower than most owners assume, and easier to lose than anybody expects. The rest of the decision is bookkeeping and habits.