The basic question is wrong. It is not "can you...........?" but should be "do you need to.......? In most cases the answer is "No"
The basic question is not wrong. A question is a question. The OP has asked one question. 'Do you need to?', is a completely different question to whether one can or can't cast 30 yards.
If you can't cast 30 yards, then the question 'do you need to?' takes on a different significance. If you can't and you don't need to, then there is no problem. If you can't and you do need to (for whatever reason), then you have work to do.