It supports Ledger and Trezor hardware wallets to sign transactions like MetaMask.
Brave Wallet supports that use case. Only use your Ledger and connect it to Brave. That will delegate signing of transactions to the hardware wallet. The private key does not leave the hardware wallet.
It's all about being a Dapp browser. The use case is getting access to Dapps.
It also seems to support hardware wallets.
But you trust a random extention?
You don’t need an extension. There are software wallets and hardware wallets that are not extensions.
You need something that's integrated into the browser to use web apps that integrate with cryptocurrencies. Like if you want to use uniswap you need metamask or something else that integrates with the webpage.
WalletConnect/WalletLink solve this problem.
WC is not a panacea, however is obvious part of cyber hygiene