I agree it is unfair that they changed the quality level that they want for documents/letters. Like previously, they were not so picky. They used to accept letters easily. And now they changed their mind and refused many ppl since last year. This is unfair that they changed stuff so easy. Agreed. To be more fair, they should've added "provide all details of your work experience blah blah".
But, thinking about work experiences, would you accept the letters that ppl sent last year to them? Our letters (including mine) were so short, no details, and were not enough descriptive. A true, fair, well organized immigration system should not accept them.