Basically you would be able to experiment on a subnet in ways you wouldn't be able to on the main base layer. So let's say you want to have a version of eCash that has full EVM capabilities, you could do so on a subnet without changing any of the rules on mainnet.
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What mean this "Subnets in eCash (ecash:native) provide developers with the freedom to implement new features without interfering with the protocol layer" Amaury