How often should you get a new iPad?

Good day! I'm curious about the frequency of upgrading one's iPad. Should we aim for a yearly refresh, or is it wiser to wait for a significant upgrade before shelling out the cash? Considering the rapid pace of technological advancements, does it make sense to constantly keep up with the latest iPad models, or is there a point where the marginal gains are negligible? I'd appreciate your thoughts on balancing the need for cutting-edge technology with fiscal responsibility. Thank you!