Are "streamers" the new "transports"?

Have been following recent threads on streamers, DACs,etc. and wish to pose a question...

But, first, I would like to limit the discussion to just streamers and NOT DACs.
The analogy to which I seek clarity is the CD transport.

Assuming I have the same DAC (Chord Qutest) in use, will a "better" streamer measurably and audibly improve sound quality. If so, at what price/performance thresholds do you see?

Is it analogous to CD transports "5-10 years ago"?
Meaning, I could use:

1. Cheap Sony CDP ($200)
2. Oppo whatever model ($500)
3. Bel Canto transport ($1500)
4. Metronome or DCS ($5k+)

...and pass the signal to my DAC then to the amp. Now, as it relates to streaming...I could then...:

1. Use Apple TV or Chromecast then optical to DAC ($75)
2. Bluesound via Coax, Opt or USB to DAC ($500)
3. Lumin or Aurender ($2000)
4. Any crazy streamer that is $5K+

Sure, it's system dependent and only noticable if you have the ears and the gear for it.

But, my broader question: Outside if the "cost no object" gear ($5K+), is there a difference in the transmission of the digital signal that then creates SQ improvements via the SAME DAC?

If so, WHY?

Thanks.