Thanks a bunch!I'll tell you why. It's to make sure that that your friend from A&W isn't giving you a fake supervisor job so you can get your PR and piss off.
The Job Approval letter is a protection mechanism for you and local citizens. It ensures that any employer wanting to support you is paying the median wage for your NOC and not undercutting Canadians for the same job. Yes it's tough to get, but not as tough as LMIA because it requires no proof that a Canadian/PR isn't available to do the same job.