It's only my assumption (fortunately), but I'm afraid that Sega is considering that there is no reason to port these versions. Due to trivial thing - there are already (for sure on Steam, don't know how about PS4/XOne, but probably there too) those "emulated" versions of Sonic 1 and 2. I'm guessing that they could name these two "android-ports" "Sonic 1/2 Remastered" or something like that, but even despite the case with the name, for some common customer (so not one of us, who is more or less hyped about those additional features in remastered editions)... There is not a big difference between these versions and those which are already on Steam (and PS4/XOne?). He/she takes a look on screenshot of "classic" Sonic 1 and on "Remastered" Sonic 1 - "heck, these two are identical, why should I even bother? And yes, there are such things like Age of Empires 2 HD on Steam, about which you could say literally the same thing (from point of view the common customer). But there is no "classic" AoE 2 in digital distribution at all, so if you want to play in AoE 2 and you're sticking to things which you can find on store's shelves (virtual/real), you don't have other choice but AoE 2 HD.