In that case, it should be called "the slightly careful user's guide for using Electrum"
Now you make me want to write a "truely paranoid user's guide for using Electrum" But I won't, as I think it's futile. Whoever wants to do that can do it already, and people who aren't into it, should probably not even try to work with offline wallets and offline signing. The same for multisig: I wouldn't recommend it to inexperienced users.

Address reuse is bad for privacy, but doesn't add a security risks (unless you also leak part of your private key). For signature campaigns, where you post your address publicly, your privacy is gone already.