Dick, I'm not sure it's CASA's role to monitor every gadget known to aviation and suggest to pilots that they get it modified.
If the pilots are so detached from the equipment they are using that they aren't seeking improvements (especially if they are doing LNAVs for real) and the manufacturers are too lazy to advise pilots when this stuff is available, why should CASA do it?
I would become mildly annoyed pretty quickly if my inbox starts getting emails from CASA with "You should update your Garmin XXX because of this!".
That's why.
Take ownership of your operation and equipment. It is your responsibility to know.