Just to nitpick, Morrowind's engine absolutely wasn't ported to Android. What actually happened is that we made an entirely new game engine from scratch that can also interpret Morrowind's game data. That's obviously massively more effort than 'just' adapting source code to run on a new platform, but unlike DOOM, the source code has never been made available to the public, so that was never an option.

Also, OpenMW's Android port is technically not official and tends to lurch from maintainer to maintainer, so if anyone reading this wants to help bring it up to scratch so it can be absorbed into the main project, that might be good.