The key thing is that USB works entirely differently from I2S/AES/SPDIF.
I2S/AES/SPDIF are synchronous protocols. Along with the digital data for your music which is sent in a constant stream, the source device also provides a clock signal to the DAC. The DAC will convert the incoming data at the rate it receives it, instructed by the incoming clock signal.
This clock signal therefore you want to be as high quality/low jitter as you possibly can get, as this will result in a better quality conversion.
(There are many DACs with various buffering or PLL systems to reduce jitter, but the TLDR is that with a synchronous source you want the clock signal to be as close to perfect as you can get).
USB however is asynchronous, and differs in two key ways.
Firstly, data is not sent in a continuous stream, it is sent in chunks that are put into a buffer in the USB implementation of the DAC.
The Device then feeds samples (in I2S format) from the buffer and converts them, but does so at its OWN rate, using its own clocks.
The USB source is not providing a clock signal to the DAC.
For this reason, DDCs and USB cleanup devices are quite different.
USB devices can reduce noise, and improve overall signal integrity, but do not affect jitter, and there is no evidence that USB 'Reclocking' (which is actually basically just a USB repeater) will provide any performance benefit other than allowing you to use a longer connection. Cause the USB audio data is not in a stream and the DAC is not using any clock signal from the USB source.
The reduction in noise however can help the DAC itself to perform better.
I2S/SPDIF/AES reclocking though, DOES directly affect performance, as your DAC is using the clock signal from the source
