You may be right about that. I'll be using USB interfaces and DAC/amps, but other than that I don't really know how any of this works to be honest. I do know that with Pro Tools in Windows I've been using ASIO, though I have no idea in what way that relates to a soundcard.
Do you require low latency playback for realtime recording / overdubbing? That's the main advantage of ASIO.
If you've got a USB DAC you want to use then the computer's soundcard is irrelevant. Check the info on your USB DAC for ASIO drivers.