Apple is at their best when they control the software AND the hardware.
HomeKit is not Apple's best.
Apple needs to make more home hardware if this is going to be a serious push into building out a homeOS. I would buy it all. Cameras, switches, outlets, window shades, door locks, sensors, alarms, monitoring bundled into iCloud Premier. I want all of it. I'm tired of managing a hodgepodge of devices that have poor response times and require things like my Raspberry Pi 4 with HomeBridge to work together. Sure, Matter will take care of that eventually. Maybe. I just want to live in a home that is Apple hardware and software together working in harmony without issues. It's why I buy all of their other stuff. It saves me time and hassle.