Plus, if for whatever reason there’s heavy EMI/RFI issues that warrant the use of a shielded Ethernet cable, that’s all the more reasons properly certified shielded Ethernet cables should be used.
There’s clear physics & engineering reasons why single-end only grounded shielded Ethernet cables are not ANSI/TIA IEC/ISO certified → Ethernet Shielding Options - #70 by Anupc ← unlike those of us with no horse in this race, it conflicts with Commercial interests of certain vendors trying to sell such Ethernet cables.