Wallet Connect is a protocol for interacting between Ethereum wallets and Dapps. Argent support for this protocol is new and Dapp support is not well established, so we've listed it as an experimental feature.
We are aware that several Dapps support Wallet Connect but have issues with smart-contract based wallets such as Argent.
Feedback on Dapps
If you're experiencing issues with a particular Dapp, please get in touch with us so we can investigate further at firstname.lastname@example.org