After Brexit, businesses trading with Europe will officially become importers and exporters, which significantly increases their bureacratic burden.
Getting an EORI number is step 1. If you don't have one your stuff can't cross borders.
Some businesses groups are calling for the government to automatically issue EORIs to all businesses it knows about.
It want getting an EORI to be the on-ramp to the process of preparing to trade with Europe, and does not want to give the impression preparing is something it can do for you.