Is it an honor to have you post in my thread. lol. Seriously, though, the default Shield is 3GB. At this time, we don't even know when did this happen. I doubt that this was recent, but that would be that the Switch may have beyond 4GB if that was the case.
Either way, the point is that Nintendo listened to a third party about a hardware spec, and adjusted it. I don't recall that happening before in recent times.
I don't think it will be that unnoticeable. General IQ, resolution, framerate, and/or special effects will likely take a hit, but it is not a port-killer like some are making it out to be.