It’s only “proprietary” because the 2.5.mm TRRS connector has an M/F molded boot/receiver. Mini-XLR has its own issues (length, size, contact area); absolutely unsuitable for my modular cable design.
Still, nice to see more modular options … even if they’re six+ years late to the party.
I should probably buy a set of each to make sure they’re not doing something silly … like using a single run of re-sheathed star-quad stock (in star-quad geometry) as their core cable …