Definitely helpful if people share their experiences and any resolutions (or lack thereof), but I don't think we'll ever get any "assurances" from EK, especially in a public way ...

I transfer a lot of points from Amex and Chase every year, including from family members into the family account, and have never had an issue to date.... but I have a very "seasoned" account at this point with a lot of history and lots of cash spend too. FWIW, I rarely use Skyward points for Awards but spend a lot on Upgrades for myself and others (including outside the family account).