Typically, once a config flow of an integration has been completed, the UI does not allow to change any parameter anymore, e.g. change a password. To work around this, one could delete an integration from the UI and add and configure it again.
However, some integrations are a lot of work to setup. For example, setting up a device_tracker based on a router typically starts by discovering all connected devices, which - at least in my case - can go well above 100. To then disable them one-by-one by hand is a lot of work. I wouldn’t be surprised if other integrations wouldn’t have similar follow-on work.
Therefore, I propose to have a generic option provided by the system to rerun the config flow with current parameters offered as default, but with the option to change individual parameters.