What is the added value of a streamer over a networked dedicated Computer

Computers fail, there’re noisy and take up space. Streamers provide absolute simplicity.

Streamers are computers

Streamers like the Aurender mitigate timing errors in the signal transmission by buffering, but this only limits the signal jitter.

rubbish. All streamers send packets of data. The DAC unpacks these packets. Any "timing" in the streamer is ignored by the DAC because the timing/jitter in the DAC is completely unrelated to the timing in the streamer and the switch. They are not correlated. Have fun spending big $$ on expensive clocks in streamers and switches, just be aware these timing signals from these expensive clocks do not affect the timing in the DAC in any way.

That said, if you don’t hear a difference, then please share your experience comparing the 2 approaches in real life.

Without wasting your time with the details. I’ve tried a LOT of cables, power supplies, switches, reference clocks , streamers, re-clockers, and so forth on the devices to feed data to my DACs. My experience is if you have a quality DAC.. all that stuff , like many other things in this hobby, is a complete waste of money. Like many other things in this hobby, many hear an improvement every time they spend more $$.

 So, the data, which represents the amplitude of the music must be correct, and error correction techniques ensure this, but crucially the timing must be consistently spot-on too. That’s why different streamers etc sound different.

The timing in the streamer has absolutely nothing to do with the timing in the DAC. The clock in the DAC is completely independent from the clock in the Streamer and the clock in the Ethernet  switch. .... completely independent

The timing of the Streamer vs the DAC depends on the connection used. If you use the USB connection, then the DAC retimes the bitstream. If you use the S/PDIF or AES connection then the DAC uses the incoming timing. This is why it is important to try both.

agreed. When I'm talking "streamer" I was talking about the device that takes the digital data from the internet and then sends it on to the DAC via ethernet or wifi. Like a Roon Core or similar. If this is better termed a server then I have taken things off track, 

if others were considering it to be the endpoint that takes this stream and converts to a data stream for the DAC via AES or other input other than USB then I apologize for confusing things. With AES or SpDIF I do agree that the streamer clock is therefore very important.