That's all fair enough and I understand that.
However, isn't the e-visa issued by the Ministry for Foreign affairs by an Embassy using e-mail? And we have to present that to get into the country on arrival right? If OP doesn't present it, then surely Immi won't have any record of it? Same as when they turn people away who have been granted visas but Immi rejects them - it's like they have no direct connection with each other.
Maybe I've missed something or haven't understood the relationship between MFA and Immi, but I am puzzled and interested in how you see it ... ????