I guess people don't know that Cryptic intentionally made it possible to move Dt between characters via the Dt Exchange?
There really is no reason I can think of why EDCs/Tech shouldn't be account bound.
That is not strictly true. You cannot directly transfer the Dil that way, as you have to sell the dill as Zen and then buy back the Dil to put it in the shared account.
This makes the transfer ability a partial exploit, even if it is quietly allowed by the Devs. If they really wanted to you transfer it they would have given you the option to do it directly either in the exchange or in your account bank.