One anecdote: some 4G products don't live within the spectral mask that they're supposed to. In one country I'm aware of, 4G spilled across the 2 MHz guard band that the regulator had created and interfered with a terrestrial TV channel so much that stations had to be moved down in frequency. The 4G operators then had the nerve to ask the regulator to use part of the now-widened guard band. And the regulator said yes, demonstrating just how much clout the mobile operators have. After all, governments around the world are getting big money for spectrum from companies that can make enormous profits from it. 5G actually is more than 4G LTE plus marketing hype, but I agree that competition for spectrum 400 MHz to daylight will increase.