The question that OP posed was answered by many. Now the goal posts are shifted - "but why does it sound better? give me concrete proof!"
:)
Help settle a streaming argument!
This is a SQ argument and is as follows- I argue if you connect your streamer to an outboard DAC the streamer does not matter it’s just serving the music to the outboard DAC to do the work. Therefore, buy a basic streamer. The other is that you need to buy a top quality streamer and DAC to get great SQ.
I liken it to cd players or the more pretentious cd transport argument- if the intent is to connect to outboard DAC the cd player doesn’t matter the outboard DAC DOES!
features and functionality aside! Thoughts…..