1) if you reply, that the fee only appears if a TX exceeds certain data size, then your simply agreeing that there was some code that was demanding fee's.
Yes, and that's a good thing.
You do believe that dust spam should have to pay a fee, don't you?
2) if you reply fresh addresses are more secure. i think you already argued days ago that 10^160 is strong enough security
I'd argue that they were more
private, not necessarily more secure.
Fortunately, you aren't restricted to one-transaction-per-address by the protocol.