Not to mention the processor is a 486...The costs are really with the certification process for anything new or different. If that process was streamlined, it would really help.
Many of the features mentioned are being brought out in apps on the tablet, so it will only be a matter of time before it is part of the FMS.
It was only a few years back that SW began upgrading, putting in a display for #2, and adding VNAV. In reality, it was more expensive not to have the #2 display, and VNAV was there, just had the cover plate (which a bent paperclip could engage).