Before assessing the eSIM security, you need to know that it's easier to track than tangible SIM cards, as you can't remove or swap it easily except by removing it, which isn't what most people want to do. On the other hand, they're more secure than the physical nano-SIMs since people can't access or steal them as easily as a SIM card. But even at that, threat actors can gain backdoor access and hack your line if there's a breach in your provider's network.