Meh. That's mostly semantics. Debian and Fedora and Mint and all the others are all still complatible distros. The days of wild changes in library standards or C++ ABIs or whatnot are decades behind us now. Are there still compatibility burps for people wanting to ship cross-distro binaries? Sure. But the overwhelming majority of binary distributors do fine with "build it on whatever the second most recent Ubuntu LTS is". And that includes games (though increasingly "make it work on SteamOS" is supplanting Ubuntu there).
