I have asked with Audiobyte and would like to share something here for your reference:
-> Reason for discontinuation of Hydra stack?
It was due to the discontinuation of key components.
However, on the other hand, they also aimed to address the issue of the previous Hydra stack being bound to ZAP.
I'm a standalone Hydra Hub user, even though I use Farad super3 as the power supply of Hub, the power-related controls in the Audiobyte official app apply to Hydra ZAP and not to Hydra Hub. Therefore, I am unable to utilize the power-related control features of the Audiobyte official app.
This issue will no longer be present in the new Superhub, as it is a new version with built-in power that can be independently controlled.
Although they say they will continue to provide updates to the old Hydra stack.
But I just bought Hydra HUB last year, and I still hope that the official can launch a plan such as increasing the price to exchange the old one for a new one...etc.