> this is optional transparency by design
It is "letting the sender trace his payment" be design and it gives chain analysts a great first step in tracing a series of monero transactions
> there is no concealment
That's the flaw
> i.e. not tracing
Only in bizarro world does the first step of a trace not count. In the real world, we "start at the very beginning, a very good place to start," to quote Mary Poppins. But in your world, apparently that is a terrible place to start -- it's not even real tracing (says you)! Question: then why do all the tracers start there?