Danger is too broad of a term. If we are only talking about the safety of your private keys and ultimately your crypto, sure, Ledger manages to achieve that. But Ledger hasn't handled themselves properly during the database leak, so they failed to protect the privacy of their customers. They are currently failing at the production of Nano X's because too many of them have battery issues. Ledger isn't great, neither is Trezor or Electrum. Electrum is a software wallet. Although it's one of the best in its class, it's still a hot wallet (unless you are using it as a cold storage) and can't be compared to a hardware wallet or a properly airgapped device.