Having been involved in recruitment in the past I can speak with a degree of experience. Attractive jobs result in your being inundated with CVs. The first task is to sort out the best candidates. With the best will in the world you cannot interview a limitless number of people. So you establish criteria in order to select who to take on to the next stage.
One criteria might well be an unfrozen ATPL. We all know some companies that require this. However you might like a reasonable company to behave, the reality is that saying you qualify and actually having an ATPL are two different things. If you have two equally experienced candidates one with an ATPL, one without you can see who gets the nod. Those that meet the criteria get considered, those that do not get the PFO. Make it easy for yourself and check you meet the criteria.
Also imagine you are the poor soul tasked to read 300 CVs. If your job is to sort out the most promising candidates I can assure you that along with the criteria, spelling mistakes and presentation really do matter. Everybody knows this in theory but the reality is amazingly different.