Training Readiness Disappearing

Yes

Yes my activities from MyFitnessPal are not transferred. The calories yes but not sport 

I do not have the training readiness on my watch, so cannot tell for sure, but most of the panels of the GCM app show up only when some non-zero data is available, so I suspect it is the case with this panel too. Little bit counter-intuitive in this case, but it may be so anyway. I recommend suggesting a change to Garmin: Share Ideas | Garmin

Yes, with a fenix 7x solar it is all but useless spending large about of time saying " No data available, wear you watch continuously for 3 days,"  I wear my watch 24 hour a day , charging one ever 2-3 weeks
no software updates available