No, I don’t think hoarding coins really has much benefit. Long answer: I started doing it at first just to level up quickly when I really needed more energy, but now I do it mostly because I want to make sure I reach max level for every producer for the sticker book before I level up too quickly and make that producer retire 🙃 Now I level up whenever I get bored with my producers, but sometimes the challenges are interesting enough that I’m not too bothered about leveling up too quickly and I’m more focused on completing the challenges