^ I honestly don't see such "integration" as much of a problem - nor necessarily an absolute advantage.
Although it can ease installation woes, particularly for the uninitiated, for anyone who is even remotely capable of a little foreplanning and turning a screwdriver should be able to wire-in a comprehensive or "staged" kill-switch, which either kills the power to all countermeasures, outright, or kills supplied power, selectively, to the chosen devices.
Certainly, integration can offer objective tactical advantages in terms of a comprehensive display and a one-step response - but it should not be a deciding factor UNLESS it is one of the SPECIFIC end-points (desire/want) of the end-user, for it is also not without some level of risk (i.e. one malfunction taking out both/all devices), nor is it necessarily the only way to "skin the cat," so to say (i.e. that a self-constructed kill-switch can be employed).
Thanks, though, mhardy
, for confirming.