Students need to solve the problems.
Students need to share how they solved the problems.
And as a result of seeing how their peers worked, students might just find additional ways to solve their problems. And you can almost bet they'll drop what they did for something more efficient and less time consuming. Don't we all?
But LET THEM GET THERE. The initial student journey can be one of the least efficient things a teacher facilitates, but the resulting student understanding lasts. And it transfers!