Quick questions: javelins with dueling style and natural weapon proficiency

[Valmark]

Again you are simply not understanding what a house rule is. If you add a rule that you made up to the rules then you are house ruling. It doesnt matter if it contradicts existing rules or not. House rule refers to rules that you make up. If you haven't made that rule up then you can prove you did not make it up by finding it in the PHB. So can you?

As you know "wield" is not defined by the rules. So we have english semantics to sort out the RAW with regards to rules that mention "wield".

What is the definition of "wield" you are using?

What would Segev's house rule be? That the hands on the weapon don't change?

In what way is yours not an house rule too then? Nothing says that the hands on the thrown weapon do change during the attack.