@mathiasmingus
there is a very simple answer to your question, and it is the only answer, adding a switch in the chain can only deteriorate, it can never under any circumstance enhance. It is absolutely impossible and anyone telling you differently does not understand the technology.
a good switch only adds a bit of latency, a bad switch can cause frame drops and cause audible issues. that said, the switch needs to be pretty bad to cause issues for streaming services.
and on the topic of streaming, there is no such thing as continues stream, it is a series of downloads into a buffer. Any media over TCP/IP and Ethernet buffers. Regarding caching, at least according to Qobuz all players are supposed to cache, but some manufacturers want to fool their buyers by saving it is a better experience if you don’t cache, but that is just BS.
anyone with foundational knowledge of the topic can verify all of the above with a packet capture.