Homekit not reliable

I'm at my wits end with Homekit. I transitioned from Insteon (which had it's own problems), when the company folded. Since then, it been train of failed devices and non-responding AppleTV hubs. I use Homekit in two homes, both my main home and a vacation home which we do short-term rentals. The vacation home is 3 hours away, and I really need the system to be reliable, but so far I need to make a trip there every 6-8 weeks to fix something with Homekit. The system run lights on automation and allows me to control locks.

I have figured out some things along the way:

1. Multiple hubs don't increase reliability. They should, but if one hub goes down, the other won't automatically take it's place.
2. Don't set your Apple TV to automatically update the OS. When it does, you are guaranteed to lose it as a hub until you are on-site to re-configure it.
3. Don't buy Legrand branded wall switches. They lose connection and even freeze operation so that they cannot be even operated by the paddle switch. If they are un-paired from your home, you will not be able to re-pair them.
4. For your WiFi devices, setup a special WiFi SSID that only operates on 2.4 Ghz band for use with those devices. Most gateways and access points will support this.
5. Homekit currently relies on Bluetooth and WiFi for communication only. Bluetooth is more reliable, but it's range is too short to cover most houses, even small ones. WiFi has better coverage, but if you have many devices, this can begin to crowd the address space on a 255.255.255.0 network. Maybe even consider adding a separate sub-net for them. This can be done with some equipment (VLAN), or use a separate Wifi Gateway.

Suggestions for Apple:

1. Build and sell a cheap dedicated hub that has support for other communication protocols (Z-wave, Zigbee, etc). They are low power mesh networks which are far more useful and reliable for inter connecting small home-automation devices, and could potentially increase the compatibility of Homekit.
2. Update Homekit for reliability. If this system is not reliable, it ain't worth it!
3. Get out of the home automation market. This may seem like a strange suggestion, but I say it because when Apple enters a market, they tend to elbow-out any competition in their eco-system, in favor of their half-baked offering.