All devices have been local for some time, and we’ve never had “cloud” devices for shades.
The “signal” endpoint is present for all raw-recorded devices (where you have to record each signal), and also present for some of the one-click devices. However, many shade protocols involve complex or rolling-code packets where we don’t have a signal endpoint: the packets need to be programmatically generated for each transmission, so there’s no way to modify the reps. Depends on the template.