Question on Aivdyne / Garmin Integrated Avionics Packages

I'm trying to understand how capable the new breed of integrated
avionics suites are (Aviyne Eclipse, Garmin G1000), and read somewhere
that although these systems are very capable, they don't have the
"mission capabilities" of a Proline 21. I.e., the Eclipse and Garmin
systems are ok for recreational flights but can't ever be used for
regular commercial service.

After looking at the functions of these systems, I can't understand why
this would be so? Would appreciate any input on what the Proline 21
offers that the less expensive systems don't....

Thanks in advance,

Jon