Is Homekit perfect, no. Is it reliable…I’d say 99% uptime in my use case, which is more than acceptable.
I have over 130 Homekit devices and also run Hoobs for occupancy control and a few other plugins.
My entire home is automated…lights, door locks, garage door, security etc.
I have tested dozens of routers, homekit sensors etc, and quickly determined the biggest issue isn’t homekit, it’s the hardware that can be the bottleneck and cause Homekit problems.
With the upcoming release of Thread devices, HomeKit will only get better.
More importantly, the pending release of Matter and Matter hardware, it will provide a plethora of options.
Google and Amazon devices require cloud access for functionality…which directly equates to security and privacy issues. If Google and Amazon already don’t have enough information, why use their hardware which gives them even more access to your life?
Homekit is and will always be the most secure option.