My home automation started years ago with Wink. I installed a number of Zigbee and Zwave devices and the Wink app worked pretty well integrating all of my smart home devices into one platform. It's when I was able to use Lutron's connected device remotes also.
Wink went away, came back, went away again, and who knows now....
I transitioned from Wink to Hubitat but didn't like the interface and went to Smartthings. I wasn't looking for a hobby, just a smart home that worked. I was into Alexa, with an Echo in every room.
I'll fast forward to now - I have no Alexa devices and I use Apple Home for all devices and automation. In order to accomplish this, and have all my original devices work, I now have Hubitat (for Zwave/Zigbee), Homebridge, and Ring security system. I have several AppleTV's and a few Apple HomePods...so one of them works as a Home Hub.
My Hubitat only works as a means to allow Home to see and control the Zigbee/Zwave devices through Homebridge. I use Homebridge plugins to connect my Ring, UniFi Protect, Rachio irrigation, Hubitat, and Tuya Platform WiFi lights. Hubitat is not at the center of my Home Automation system. All of my devices showing in Home are not 'HomeKit Certified'....and I'm guessing that doesn't matter too much.
I would like to have better integration between my hubs and I'm hoping that Matter will provide this. I would like to have my Hubitat hub integrate directly with Apple's HomeKit and possibly have better control of my devices. I am by no means an expert when it comes to home automation, but I think with every device there are differences between the properties that are exposed. For example, from Hubitat I can see battery levels are possibly more accurate details regarding its state. With my current implementation going through Homebridge, maybe I loose access to some of those properties (ability to view or control them)....or possibly the information is stale?
I think most folks with a larger implementation of smart home devices have to leverage more than one hub. It's my understanding that Matter will support better integration between hubs. Of course, this is all dependent on its implementation on those hubs. For example, I've read that Smartthings has implemented Matter on some of its hubs, but decided not to expose Zigbee/Zwave devices with its Matter integration. If this wasn't the case, I would have been switching back to Smartthings....and wouldn't have a need for Hubitat any longer. Again, for me, Hubitat is just a means to get my Zigbee/Zwave devices into Apple's Home system.
From my search on this community site it appears there is more interest in Thread when it comes to devices, but I don't see much interest regarding the integration between hubs. I'm curious if others have use for Matter support to integrate with other systems like Apple.