It's always better to have more options. Now they can weigh the tradeoff of taking more power from the solar panels in exchange for size+weight reductions of t

It's always better to have more options. Now they can weigh the tradeoff of taking more power from the solar panels in exchange for size+weight reductions of the craft and possibly an increased service life. Another tool in the box. Electricity is the only thing a spacecraft can get more of once it's up there.