What model of MacBook Pro are you thinking about?
I still have early 2008 15-inch MacBook Pro with optical digital audio in/out (3.5 mm analog/optical combo jack). I’ve been using FireWire 400 connected to Apogee Duet (saves 2 more usb slots). Oh, and updated internal disk to ssd, new graphic card and ram. Sufficient digital source for me.
#saveappledollars