Depends on the target market. For me, not having any of the above mentioned "features" is a selling point for me. Do other people care? Possibly no, but that doesn't concern me.

also, Firefox OS devices have potential to be cheaper than android devices, because there's no extortion from Microsoft, and may be consistent, unlike Android with many terrible manufacturer-made OS modifications and version fragmentation. Even now, android 2.3 devices are sold.

For me a device without native apps is a no go.

I already have a browser and for the looks of it, FirefoxOS still needs some performance tuning to reach the level of throw away Android and Windows phones.