If a component has good analog+digital volume control design, there is no need for HT bypass. This concept is out of date.
For more details, see https://nuprimeaudio.com/ufaqs/what-kind-of-volume-control-and-preamp-do-you-use-for-your-dac/
Basically for DAC-9 or DAC-10, the analog input is the HT bypass, regardless of what volume you set.
For Dirac to work well, it has to "scan and record" your room acoustic, and then pre-process your music on the computer before it is sent to the DAC+amp. It is possible to have this done inside the same box as the DAC chip, but effectively we are just moving the "computer" from your desk into the DAC or AVP device. A "computer" could be an embedded linux or Windows board, or could be a DSP board that runs the Dirac algorithm.
Ideally if you have Dirac, you won't need DSP features such as EQ, and cross over etc. But we don't have ideal speaker and our hearing are different.
Dirac can't compensate for our loss of hearing or personal preference and that's where DSP is needed.
Putting all these together in a box is expensive. And your component can be out of date quickly.