I wouldn't be so harsh on easyJet here. The core problem is that EASA allows national CAAs to make their own rules when it comes for a licence entries.
Example 1. You have a UK licence and UK TRE, the LPC is successful, TRE enters new validity of the rating in the licence, rostering is notified of the new validity, story finished.
Example 2. You have a licence from an EASA member state, and a foreign TRE (still EASA, but has licenced issued by other member state). You do the LPC, but your CAA deems foreign TREs not capable enough to write couple of letters and numbers on the licence, so you have to submit all the paperwork to them, wait couple of weeks and they send you the new licence, which you then send to rostering.
See the difference?