So you basically mostly/usually have to just trust they sent you the amount they claimed they did?
Depends on the use case?
It's a token on Ethereum, so there should be no issues with simply sending the Ethereum around.
In short, the idea is that you can lose your Ethereum transactions trace by using the protocol.
So people can just send you the Ethereum and you will know the balance. Then you can privatize the Ethereum which you received if you really need to.