I read through all the posts. I see both sides of the coin. Here is my take:
There are plenty of unspoken policy. ETWs are treated under different standard. The chance for conversion to FTE is always very low, but not impossible. By very low, it means that ETWs would have to fight among themselves for a few vacant positions. Unless there is pant expansion, new facilities (insight knowledge is the key), the conversion rate is very low. The vacant positions are mostly created after somebody retiring, getting fired, leaving for better job, disabled after illnesses. Nike may hire many more ETWs in than what they need to fill those vacant positions. They would screen and choose the very best. And they're in position where they can let go the entire ETW group, and get a new group in, until they can find workers that tick all the boxes! They always remind new hire during the the hiring process that there are thousands of resumes they're receiving. Who knows if this is true or not, but you get the idea!
They can move workers from other shift around, so that they can fill the vacant positions, to get away with perma-temp worker. Now they hire temp for the different shift instead! If you stay long enough as FTE, you would notice people know people from different shift all the time!
So if you want to be converted to FTW from ETW, learn to do the job as good as the top FTE workers in the shift. The lazier, less productive FTE workers can get away, carried by the good ones to hit target as a team, but ETW workers won't! ETWs can easily get fired by their first ever mistake on the supervisor's bad day. FTEs are protected by the discipline system, so they have much more leeway on " separate" "single" small issue.
I am a former ETW turn FTE. I am the only one converted from the group of 20 ETWs at the time. I had seen 3 groups of ETW in the past 3 years since I became FTE. One of the group completely gone. One group had 4 people kept. The last one got 2 people.