That’s a good point, being able to sync the halves would be really cool for this kind of setup. It’s something that’s actually available from companies like Sonos, where they are syncing and filling rooms or outdoor spaces with omnidirectional sound which is really cool!
This project has a bit of a different focus from that market, to allow a portable bluetooth speaker to produce stereo sound for more critical listening, more like the experience of playing a newly released album for the first time and wanting to listen to every detail in a seated environment. In doing some research for this project that’s something that audio producers and musicians really wanted!