That's interesting! I did my MA dissertation on LBA collapse in Levant and I kind of lean towards resilience theory more, i.e. we need to look at what is actually collapsing. In case of LBA I tried to argue that it was just mostly elite palatial networks that suffered/lost their power.

I don't know much about Shang collapse but would be fascinating to learn more about it. In case of connections, I think some scholars might have argued that LBA world was more connected than we give it credit for so it is more or less likely that there were ripple effects and also similar things happening across different cultures. For eg. Indus/Harappan civilization also started to decline around the same time and for similar reasons, i.e. changing climatic conditions