I think there are three variations of Transport;
- The traditional CD or if you're lucky to find SACD transport.
- Digital transport and;
- Streaming transport.
If you already have a standalone DAC or one which is integrated with the amp, it makes sense not to have an overlap and potentially this could save on the costs.
Though, I suspect these transports don't come cheap.
Eversolo Streaming transport also serves as a digital transport which is brilliant.
Still it'll be nice if someone can come up with a universal transport that has all three functionality.