That is how I learned. When I returned to quiliting in the 2000's it was amazing how those gagets helped with accuracy. You don't need them all but a few of them do make quiliting easier. Quilting should always be fun. When it becomes work and not a joy then, why are we doing it? If a plastic template and a few gagets make it fun, go for it.
Can you imagine quiliting with scraps of discarded or worn out clothing? You only had a scissors, needle and thread and were perhaps riding in a wagon or sitting by a fire to complete a blanket to keep your family warm. We are privledged and should be thankful for our blessings. None-the-less we honor the craft, the creativity and the skills of quilters from around the world and across time with our efforts.