Because it works for the most part as SFM - and AFM for all those aircraft would make the cost to make FC3 too high and you wouldn't see FC3 this side of 2016.
Nate
No, you need Lomac for FC1 or FC2 or FC3 - for convenience FC3 will detect FC1 or 2 and assume you have lomac installed at one point.
Only LOMAC is required, read more carefully before ranting.
Nate
You can always try to fly any of the module aircraft. However if they are not installed, or not installed correctly, or not activated correctly, you will be presented with the transparent cockpit.
Nate