Its like saying "Hey, Chevrolet, you know your customers like the radio station set to 101.9, why cant you engineer your cars to respect their choice instead of forcing your nefarious 101.5 agenda."
Yeah, but this is a Mozilla car analogy we're talking about here.
In the current 2015.7 model, release, the UX team has decided that a 5-button hamburger menu on an AM dial (and only from 1100Khz to 1150KHz in 10KHz increments) is all that's needed. Users who want to access a wider range of frequencies in the AM band are free to write an extension or purchase a third-party radio head unit.
To further improve the user experience, we remind prospective extension developers that in the Aurora channel for the 2016.1 model year, the about:config setting for frequency.megavskilohertz has been removed, along with the FM antenna. The UX team has made this recommendation based on telemetry that suggests that few drivers actually listen to FM radio, especially since the 2013.6 model, in which the AM/FM toggle switch was removed because the UX team for 2012.1 felt it was cluttering the dashboard.