I definitely agree - particularly since some developers even don't publish reference data required to do the calculations or write a third party tool to do so. "Use a real world FCOM" is seen far too often as a simple and quick resort to escape the discussion (I'm not referring to IXEG here, though - we'll have to wait what they provide with the v1 release package or upon request before judging). Well, the problem here again is that a sim pilot covers at least three real life roles: dispatcher, load master and pilot. PFPX was built to support the dispatch tasks (one can argue how well it does this, particularly when comparing with other solutions like SimBrief), but not the tasks of a load manager or ramp agent. Maybe it's really time to start a community project to build a more comprehensive solution covering all roles (perhaps combining an EFB with load calculations and route planning capabilities). It's a complex task though, taking into account that specifically fuel and load calculations have to be implemented individually for each single aircraft model.