On my Vero4k, copy through LAN to 2.5" external HDD connected to Vero’s USB is about 8-11MB/s, as it has 100Mbit LAN. Vero4k+ would be faster, because its 1Gbit LAN.
When I need to transfer large amount of data, I will unplug HDD from Vero and connect it to my main PC through USB 3.0. There, it run at about 80-90MB/s.
I dont need NAS or file server for streaming media to Vero. I dont see a point in this - having another super-expensive box, which consumes power, run 24/7. Just look how much those NAS costs - brutally overpriced for what its inside. For my needs, I would require at least 4 disk one, but no, I dont give them about 400euros just for the metal box with a small piece of electronics in it. And this is without drives. Just for be able to stream media to Vero4k. Hell no.
From time to time, I update media on that external HDD and its all done. And the possibility to copy media through home LAN into Vero4k, or to external HDD connected through USB to it, is very convenient. I dont see a point, why it shouldnt be considered as normal, as some people states here. Its just simple file transfer, I consider this as one of the basics which every LAN-enabled device simply must have.