The way I see it, it's most likely one of these things:
1. From the beginning of the first batches they put them in but stopped for the later batches
2. They didn't to start, then agreed that it would be a good idea because the screen scratches easily
3. They always intended to, and have a shortage of them so some batches don't have them
Or
4. It's whatever the packer has to hand and it's pretty much random.
Maybe we could find a correlation between some of the earlier units that had the loose fire button issue and if they did/didn't have the protector... Or, we could drop Smok an email and just straight ask them what's the deal. Might be an easier option.
My money is on 2 or 3.
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