So I currently have multiple 3rd party lights integrated into Aqara Home via matter, and love how well it integrates. Im able to flawlessly make automations with these 3rd party devices.
I have an ESP32 C6 connected that has an RGB LED connected to it, and the process was pretty straightforward to connect to Aqara Home, and then I have a Govee Plug and Govee Presence sensor (before I found out about Aqara devices) and there was a little hiccup with getting them connected since they were connected via the matter bridge Addon in HA, which was caused by the Addon, I fixed the issue quickly. Overall the process was straightforward and smooth to connect to Aqara Home.
I think it be would be nice if the interface for the 3rd party switch matter devices had an interface like the Aqara switch interface, plug interface, or Aqara light interface depending on what you choose. A comparison with images is shown below:
If it were for the plug interface, it would likely exclude the energy tracking unless it was included in the matter device.