Not sure if the PIE Cookbook plans to continue with the CC BY-SA license, but if it does, the SA restriction can cause friction for reuse of the Cookbook. IIUC, it means that Cookbook material could not be remixed with any material that has a clause like NC or ND as the resulting work could not carry the SA from the Cookbook license.
For example, if I wanted to create a handbook for a new accelerator by remixing parts of the PIE Cookbook licensed CC BY-SA and parts of another work that was licensed, say, CC BY-NC, I could not legally publish the resulting work because the CC BY-NC material cannot be changed to the CC BY-SA license that the Cookbook's SA clause would "demand".
I recommend the Cookbook adopt a simpler CC BY license to maximize reusability and yet maintain reference to the provenance of the Cookbook coming from PIE.
You can review a CC license compatibility matrix online, and learn more about SA compatibility specifically.