There’s also the option of dumping the cross-platform requirement. Which platform is most important to the author? Then narrow down further by deciding on which

There’s also the option of dumping the cross-platform requirement. Which platform is most important to the author? Then narrow down further by deciding on which configuration of that platform matters. Define those things, then build the best DAW possible. In my mind, this doesn’t rule out web-based stuff because I view the web as its own distinct platform.