Do I Really Need a Dedicated Streamer?

To the OP:  a good lawyer doesn’t just answer your question if there’s a problem with the premise embedded in your question.  Similarly for good audiophiles.  As many have told you, if you stream using Spotify, you’re wasting your money if you spend more than Wiim (or RPi) money on a dedicated streamer.  Spotify streams at about the same rate as the high option for Youtube!  If you ever solve/change your music source, come on back - there’s a lot of nuance - and some disagreement among members - regarding exactly how much and in what use cases dedicated streamers can make a significant difference.

Nope. I have not, nor will I ever, stream. 

The Wiim products are a great path on which to begin. Just got the pro unit the other day and it works just dandy. It doesn’t seem like it will do the DSD stuff but I’m not to that worry at this time. Also have the Wiim B06 in the other system that works great as well. The Plex app is what transfers the music from the computer to the Wiim units. It works great and is of a low cost. Highly recommended. 

OP, just stay with what you have. Spend extra money on something else entirely for which you know for 100% certainty you are getting something that makes sense to you.

I upgraded from a Squeezebox Duet to Chromecast Audio to Bluesound Node X and to the Auralic G1,1. When streaming from Qobuz, sound quality appear almost as good as when listening to my MD Étude FM tuner. I also use a Chord Qutest and a McIntosh integrated amp.