The 'audiophile' stuff is handled by the DAC. If the DAC can't clean up
noise and jitter on the digital inputs, it's poorly engineered; look
elsewhere."
The thing about DAC's is that they have limitations. I mean, even the best DAC on earth is going to have a problem if you have transmission delays lasting half a second. Some of this could be network related, some could be the OS and how "real time" the response to the USB request is, so I wouldn't put this all on the DAC per se.
I will say that modern DACs handle this much better, in the last 15 years or so, and that to me is the biggest reason to upgrade your DAC.
Streamers are unstable. Companies making them may come and go, the services they talk to (Tidal, Quboz, Spotify, etc.) may come and go and some one has to keep up. USB DACs require drivers, and the phone/tablet apps need to stay up to date.
My point to all of this is, a good streamer is worthwhile, but it's also not going to live very long. Your DAC and other electronics will be working long after the streamer has turned into a brick because of the latest iOS/Android upgrade.