This was true decades ago but for the vast majority of modern applications users would be just fine sharing spectrum and dynamically negotiating/avoiding each o

This was true decades ago but for the vast majority of modern applications users would be just fine sharing spectrum and dynamically negotiating/avoiding each other. If you go look at an SDR waterfall you'll find that vanishingly little spectrum is ever in use but almost all of it is reserved for various interests, mostly using legacy analog modes. We need more and wider unlicensed bands, there's no reason for most of this regulation anymore.