I'll be closely following the development of matter, especially when it comes to compatible devices. Cloud dependency of many devices for the most basic functionality offered is an absolute dealbreaker for me. While I doubt that there will be meaningful change when it comes to the app mess retrofit smart home systems tend to create, I really do think matter will offer significant improvements. Knowing that I will still be able to dim my smart lights even if company X goes bankrupt makes is slightly easier to justify spending the premium on smart bulbs.

Also, I really hope that having one universal application level protocol for a variety of devices will further improve the home assistant experience. While the device support is great for many big brands, smaller brands (especially those outside the US) are sometimes lacking integrations.