Re: How to understand these transactions all using the same address?
Your wallet will not take dust from other addresses, while it will take all utxos from your unique adress. That's why there isn't any dust when you use only one address.
It sounds like you are maybe talking about an account on an exchange or some other website or online service, which might explain your confusion. These online services, in which someone else holds your private keys and holds your coins are not really wallets at all. If you are running a actual wallet where you control the private keys, then which specific address within that wallet the output is on, or whether you have multiple outputs on one address or spread across multiple address, is completely irrelevant.It is completely trivial to make a transaction which combines multiple UTXOs from multiple addresses as inputs.
So your solution now, is to "combine multiple UTXOs from multiple addresses as inputs" LOL
how do you know if the wallet is able to do that? Do you really think people want to do this kind of trick for each transaction they are sending? Are you doing it yourself?
You could also have proposed to write entirely the raw transactions manually...
