I agree, all Muse 2016 devices should come with a big label warning users that Muse-io is not available (and it may never be, to be honest).
That said, I can collect data using Muse Monitor on an Android device. I usually stream the data to a PC running MuseLab (mostly for display purposes), but it could all happen on the Android device.
In sum, yes, it is suboptimal, plus there is a certain marketing misleading (the ads make you assume that the io tools are available for the latest Muse version; why shouldn't they?). However, it is not a killer, and you can still use your Muse for simple research projects or pilot data.