Conclusions are possible, the causes are known. You aren't going to get it from the CDC though.
The problem is the first round of vaccines caused immune fixation. The boosters failed because the body can't tell the difference between such similar proteins and made antibodies for the 2019 spike variant instead of the one the booster was targeting, thinking it already knew what to do.
This was covered up during approvals by redefining the success criteria as elevated levels of antibodies to "spike protein" without being specific about which one, and then ignoring actual effectiveness numbers (which were zero or negative).
The problem is the first round of vaccines caused immune fixation. The boosters failed because the body can't tell the difference between such similar proteins and made antibodies for the 2019 spike variant instead of the one the booster was targeting, thinking it already knew what to do.
This was covered up during approvals by redefining the success criteria as elevated levels of antibodies to "spike protein" without being specific about which one, and then ignoring actual effectiveness numbers (which were zero or negative).