any particular reason? i run a full node, but never considered running a testnet node. my next step would probably be a lightning node if anything
testnet is really useful for the network in general and without people providing nodes it wouldn't work. For personal reasons, if you ever want to test a new wallet you can test it using the testnet with your own node to increase privacy.
I don't have anything against running a lightning node either, however running a testnet Bitcoin node is much cheaper and simpler.
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