From my perspective, the only good reason to develop those class D and other similar classes that will follow is environmental. On the other hand, the less expensive they become the more people will have hifi, sort of, and that will be bad for the environment.
As for the sound, tubes will sound best in the foreseeable future, if done right and matched with done right speakers. Even transistors are not really needed, nor is digital except for archiving until they figure out how to preserve master tapes for thousands of years.
As for the sound, tubes will sound best in the foreseeable future, if done right and matched with done right speakers. Even transistors are not really needed, nor is digital except for archiving until they figure out how to preserve master tapes for thousands of years.