Yes, by nature if your training input comes from the field at a rapid clip. In that sense it's probably not much different than dealing with captured video or photos. If it's a vision system, it is in fact overwhelmingly photos (say 3 per second, 24 hours a day). You may or may not be able to really effectively do all of your processing on the MBP, but you can get it off the MBP quickly. For me that's been an outstanding feature.Reading this brings Niagara Falls to mind. That’s a lot of data moving around. Wow.
Any professional use case where large chunks of data are changing regularly is going to gobble up bandwidth (or hit you with the time is money hammer). Professional meaning that if you lose some data, you're not the only one that pays for it
In my non-professional use... a lone TS3+ has what I need at home (and then some), minus 10G ethernet. Fortunately 10G ethernet is easy to get standalone via Thunderbolt.