I think you are now floundering about.. No criticism, just an observation, and it happens to us all when we start getting new information.
The Yamaha is no doubt an excellent component ,and if your objective is to stream from the internet via your home network , I am sure it is great. It will happily stream Hi Res audio from the web or any servers you have ,only depending on the quality of the source material... CDs even ripped onto Hard Drives , Computers etc will not meet the minimum definition of Hi Res.
Whether your amplifier will be in a position to properly handle Hi Res , or your speakers , or your ears , and distinguish it from standard full CD quality is another discussion. But if you want HI RES files, the only way you will get them is by paid subscription to the highest tier on the likes of Tidal or Quobuz.
Just a minor correction to Uggs latest. The output from the Yamaha is always Analog, The inputs always Digital over a network, so there is no way it can be the missing link between a CD player and an amplifier.
Other DACs?? . These Devices may or may not have the streaming function, some will have USB inputs ,some have coaxial SPDIF, some have optical SPDIF. Some very recent AVRs have all these and digital room correction software included.
What is unclear is what you really want, what you are prepared to pay for it , how wedded you are to the Pioneer and its CD player, and what nature of network you currently enjoy. There are just so many ways to skin a cat in the audio world, the problem is deciding what you want.
Since you are in NI a visit to Richer Sounds off the Markets in Belfast will pay dividends. .. park in the Castle Court and take the rear exit from the Shopping Centre...