I see a listing of the children, and I see things set in a chronological order, that chronological order does not make mention of daughters until after Seth was born.
You demand that the chronological order of Creation be followed textually, right up until the moment when the chronological order, followed textually, proves you wrong, at which point, you immediately demand that the chronological order NOT be followed textually.
You need to provide proof that something happened, not demand that I prove that something DIDN'T happen.
Let's play your game...I say that Jesus made mention of the Designated Hitter rule during the Sermon in the Mound, but it was not included in the Biblical depiction, and as proof, I offer the fact that the Bible does not say that He didn't.
Just as it doesn't mention Adam going potty in the chronology (but the text doesn't exclude his need to go potty), it doesn't mention other children, but doesn't exclude that there were other children.
You demand that the chronological order of Creation be followed textually, right up until the moment when the chronological order, followed textually, proves you wrong, at which point, you immediately demand that the chronological order NOT be followed textually.
The difference is that assuming Adam and Eve had other children between Abel and Seth does not cause me to contradict scripture. If you can show me where I have contradicted scripture, I will be happy to reexamine my understanding.
Your ideas contradict the entire Chapter 2 of Genesis.