@jonasschnelli I'm in the camp that rbf should either be set by default with a checkbox to unset it per transaction, or entirely off in the settings. Or the other option, of having it not set by default, but you get the behavior I first described if you set rbf on.
Electrum currently makes you set rbf on for every transaction even after making the option visible in the settings. Which imo is annoying. Should be default.
cbits: I think the GUI can handle RBF pretty well. I see more potential in improving the RPC API.