Do different streamers really sound different when using an external DAC

Wouldn’t call the RME analytical at all unless ones system is bright to begin with. The RME is very revealing but it’s not bright or analytical. My guess is those that claim so haven’t really heard one or if they have not set up well, or were using Toslink and maybe standard Spotify or Tidal. 
I’m running my RME currently direct to a Pass X250 into Aerial Acoustics 7Bs which is far from an overly soft setup. I also own a ModWright LS36.5 preamp which is a fine preamp and the RME direct loses a little of the warmth the MW adds but makes up for it with its crystal clean refined top end and lower noise floor with extended bass slam.

Owned tube amps over the years which I enjoyed but I’ll take transparency over things being rolled off. I do currently own a tube phono preamp as well. I’m sure the Tubadour is a fine product that I have not heard, but I would not write off the RME, especially with a better power supply.

If I was using USB to the dac, then the pc/Mac/streamer could make a difference because some vendors try to make USB sound better. Since I don't use USB, then no. All a streamer server is is a proprietary computer, most of the time running linux, and a proprietary version of linux at that. Most streamers have more processing power than what's needed but probably makes it easier for some to charge the higher prices. Its pretty hard to justify a $13k streamer with hardware that's over the top to a 8 year old Mac mini that runs Roon with 6 end points that takes 15% of the mini's resources, again, not using USB

adg101.                                                                              I do have the fs model. I have looked into the Teddy Pardo.  After having spent the money for the upgraded pc on the BS I didn't see any improvement. If you say there is an improvement using the TP power I would need to try myself. Don't know what the return policy is. In my own mind I don't think there is that much difference when using small PC. Also I read from RME that they supply the unit with the best PC and any other would not add any extra benefits. Again results are always different in your own system, mine included. Thanks for reminding me about the TP.      

I am using the BS 2i with a MQA DAC. 

Sounds fantastic and don't plan to upgrade the streamer for now. 

Spend time reading music reviews and exploring new (to me at least) albums and artists. 

I find the quality of the recording makes a huge difference.  Greater than any one piece of equipment. 

Is not enjoying the music the reason we spent so much time and money  on our great systems 

It certainly is, vanson1.