As of right now, Matter devices have Edge drivers like you see here:
From another topic discussing Matter, we’ve already seen that just because Matter is a “standard”, it doesn’t mean each implementation will support all capabilities of a given device (just like today). The Third Reality Nightlight has the ability to turn on/off, change dimmer level, and change color. ST as a Matter controller can only control on/off and dimmer level. Echo devices as a Matter controller can control all three. We also know that ST hasn’t committed to provide bridge support as of yet. So at the moment, I still see there may be a need for 3rd party developers just like today.
Here are a couple of threads discussing Matter you might find interesting.
Matter Device Support - ST platform
Matter - smart home connectivity standard (formerly Project CHIP)
I hold out hope that Matter will make things simpler for the home user, but I’m only cautiously optimistic at this point in time given what various manufacturers have delivered to date.