I think the question is more for the people of Lazarus. Why did they decide not to make OPM as a standard package. IMHO is this not related to fpcupdeluxe.
Alfred makes with fpcupdelux a very usefull tool, but this is a tool for the installation of Lazarus itself, not for the extra software. And remember, OPM is thirdparty, not a core of Lazarus (yet).