My experience with improving my digital signal feeding my dCS Vivaldi upsampler and DAC with incremental hardware improvements includes: Etherregen, 4 different CAT cables, Farad LPS with SR fuse and their best cables, AfterDark mid tier ($1300) 10 Mhz clock and premium cables, a second full Farad LPS set up like the first, installed fiber to the Etherregen so I could go back and forth between copper and glass. I had created a $4000 house of cards that did in fact produce better sounding music out of my Vivaldi digital system. I then replaced the dCS upsampler with a Grimm MU1 streamer/server. I tested each piece of kit with the Grimm and none of it made better music than the cheap builder grade CAT 6 feeding directly into the Grimm. I also had to get to a Sigma V2 to better the standard supplied cheapo power cord.
My point is that as streaming matures companies like Grimm are adding jitter and noise reducing technology inside their boxes. They also engineered their power supplies so you don't have to buy exotic cords to get great sound. By my own ears I know the additive boxes and cables discussed in this forum do improve many systems, but in the longer run they will be built into more streamers in the future. And yes, I hope there will be tweaks for the next generation of streamers as well.