I have been using hubitat for a few months now. Running about 20 zigbee motion sensors, lutron light switches, and a few hue light bulbs, the zigbee mesh is being supported by 5 centralite plugs. Everything is going better than I anticipated, but I am thinking about adding some innovelli zwave light switches. #1 reason is I want to be able to disable the switch from physically cutting power to my hue lights. #2 Scene control on the innovelli red switches. #3 to establish a zwave mesh to give me more device options. #4 to have the innovelli red notification leds in a few key spots in the house. Am I risking much stability in adding another protocol? Is the utility of the innovelli reds actually as useful as I think it is?
It may sound silly one of the greatest thing I am struggling with home automation is trying to avoid doing things just because I can, there is just so much cool stuff out there that I want it all.
I've used Z-Wave switches on ST and on HE, and both have been fine for me (once we got to FW 2.2.3.148. I would not see any reason to avoid Z-Wave if there are features on Z-Wave products that you want. The C7 hub has had its teething issues w/Z-Wave, but at least for me that has settled and things are working w/out issue w/my Z-Wave devices.
That does not sound silly at all...to quite Dave Barry, "The two most dangerous activities that mankind engages in are war, and home improvement projects." 
Inovelli's Gen2 Red Dimmers are perhaps the best smart-home devices I have used period.
I've been quite firmly in the zigbee camp for a few years but saw enough people saying good things about Inovelli that I decided to check them out. I quickly realized that my aversion to z-wave had been due to earlier protocol versions and lack-luster products (looking at you, Jasco). Aside from the physical quality aspects of the switches, the excellent installation process and great support the company provides, these made my z-wave mesh absolutely rock solid. They did for it what xbee's did for my zigbee mesh.
Only gotcha right now is the likely need to update firmware if looking to include with S2. But that's not an overly painful thing, just so long as you are aware.
Completely agree. It's an attitude that should serve you well when it comes to Acceptance Factor 
This is good to hear, do you find yourself using the led notifications much? I only intend on installing 3-4 switches. How close together will they need to be?
led notifications: no, I use a couple as night lights 
... i think this is somewhat of a philosophical question. having to learn a new thing is at odds with acceptance factor. [edit: perhaps i can introduce this slowly, over time, the house is in FL, so maybe some sort of indicator for wind speeds could be seen as useful, things like that]
proximity: thankfully my house is only 1700 sq/ft and 1 story. I have not needed to know the answer to your question, lol. But since z-wave operates at a lower frequency than zigbee, they probably can handle longer range or more obstacles. The longest leap in my own environment is probably about 35 feet, through 2 walls - no problem.
I'm thinking of things like having the led turn red if mode is nighttime and the doors are not locked or the garage door is not down.
Good to hear about the range, my house is a smaller ranch, and the first switch will be right next to the hub, and the second will be directly over the first, should be easy to expand from there.
Thanks for the help
That's very useful...I've instituted something like that (using a normal color bulb as the warning light) at our house and it has solved the problem of us going to bed w/one or more door or window wide open/unlocked. As long as the notifying light is in the path of your transit to bed, or in your bedroom, it works very well.
I hear you, for myself those would be cool ... but to explain it to the wife, I can already hear her blood pressure rising. I secretly have double-tap up or down set to instantly go to max or min brightness - but some people would rather stand there holding the button for a while rather than learn a new thing. Different strokes for different folks.
I probably wouldn't even show my wife the scenes. The scenes are attractive, as I would likely change the default press to turn off the hue light, but would make physically turning off the power to the bulb be like a 5 tab down. It would allow me to power cycle if I needed to, but not have them turned off when we have guests. My wife is pretty adjusted to the motion lighting combined with the voice controls, highly unlikely she would ever actually touch the switches.
