So when humidity goes up in the bathroom, the controller would kick on the exhaust fan.
When temperature drops in a room that is active below a set point, the fan is kicked on for the forced air to start circulating + heat would get kicked on if necessary.
The whole point of having a smart home is to have a smart home that does stuff for you. Walking into a room and having lights turn on is the best thing EVER. I don't want to touch a switch if I can avoid it.
If sensor traffic is not meant to go on a Z-Wave network then they shouldn't allow those device classes to exist on the Z-Wave network.
On the sensors I had I cranked up the change required before it would report, but it also did periodic reports. I had to also update those so that the network wouldn't get flooded.
Sleepy devices/battery powered devices on the Z-Wave network for things like window sensors/door sensors is kind of the norm. It's hard to run power for all those things, and those sorts of security sensors are handy for not just automation but also for peace of mind!
The thing is that I have a similar setup now with Zigbee/Thread devices... and everything just works. In fact due to not having motion sensors that also act as humidity/temperature/light sensors I end up having more sensors on the network, yet it is far more stable.