I can't quite tell what this is doing besides providing multiple terminal panels from a look at the front page. Can you help explain the unique workflow better?
I too find monorepos superior at this point in time. There are essentially the same complexities both ways (polyrepo), two sides of the same coin. I have broken slightly, having "megarepos", where most code is in one place, but a few are broken out, possibly another "megarepo". The most natural split is public vs private.