> the agency said it was confident that a change to the re-entry trajectory would be more than adequate to offset any spalling issues. Somewhat confusingly, they also announced their intention to switch to a new heat shield design, starting with Artemis III.

It's fine to be concerned, but this kind of take is why public agencies are damned no matter what they do. In the private sector, operating with the suboptimal resources you have while working on a better iteration is standard practice, even in industrial settings. But when you're a public organization, if anyone can find anything that is less than 100% optimal, the same people who complain about how slow the public sector is will complain that you're cutting corners, or that you're inept.

> the agency said it was confident that a change to the re-entry trajectory would be more than adequate to offset any spalling issues. Somewhat confusingly, they also announced their intention to switch to a new heat shield design, starting with Artemis III.

This is not confusing in the least. Engineers don't talk about safety in binary terms. It's not "safe" vs. "not safe". Instead, it's all about the probability of a bad outcome. At NASA, they compute the probability of Loss of Crew (LoC) and the probability of Loss of Mission (LoM).

For Artemis II, a change to the re-entry trajectory brings the LoC/LoM back to an acceptable level. For Artemis III, which a new shield design, they can get to the same LoC/LoM with a different trajectory (which gives them other benefits).

Stop thinking in terms binary terms. Everything is a probability.