Export controls or legal compliance, most likely. Export controls because the code may be a protected technology, or compliance because the company doesn’t have gdpr or some other legal framework.

I just unplug the mouses USB from the PC and plug it back in after putting the PC to sleep. Et voila, pc no longer wakes from mouse.

REAR Relax-and-Recover will do entire system point-in-time snapshot backups to a bootable iso or physical USB thumb drive: https://relax-and-recover.org/rear-user-guide/index.html

I use rear for backing up my root, and Borg for packing up user data (for versioning, file recovery), but you can use rear for the entire system too.