I already have the Soundbar Pro with 4 surround speakers and a subwoofer. Love it. No reason to upgrade (send Roku more money) unless you upgrade the Soundbar Pro. (Ultra?). What it needs:
1) Wifi 6e
2) Gigabit port
3) Second HDMI input
4) Dolby Atmos - Start working in Atmos support. Doing it like you did for front speaker support would be clever. Soundbar Ultra does all the extra Atmos work, but passes it over to external speakers when they exist.
