this post was submitted on 12 Dec 2023
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Wi-Fi is a shared medium where airtime is split amongst multiple clients on a radio spectrum that is open for all the public to use.. Wired gives each device dedicated bandwidth with no interference. Wireless gets better and better, but it can never, and will never, be faster than a dedicated cable.
None of that are physical limitations, it's purely implementational. Legacy ethernet was half-duplex as well, before switching and dedicated pairs for tx/rx became the norm. Handling of the shared medium is done with CSMA-CA and not -CD, which was used for ethernet, so at least we learned something.
Copper is also susceptible to interference, both RFI and EMI. Sure you can mitigate the effect by shielding and twisting the wire pairs with different amounts of twists pr length. But in the end, copper is also susceptible to interference.
I'm not an RF engineer, and I don't have an idea of what can be done to mitigate noise in wifi even further. But claiming that it's an inherent physical limitation, that can't be mitigated, that's just defeatism. It's about the implementation, not physical constraints.