This article is a bit disingenuous. Optimism, Arbitrum, and Starknet are all part of the Ethereum ecosystem. Technically, Polygon PoS isn't, but Polygon zkEVM definitely is.
If you were following the pattern in the title, you'd say "Most operating system developers aren't working on Windows, Linux, or macOS". That might very well be true.
The patches are in place if you wait just a bit longer. NixOS merged patches into their main branch and the teams between Wayland and Mozilla have already resloved the issue. The only bit that rubs me is that this has been an issue since 92, has been out. I moved from beta to stable and then stable to ESR (v91 luckily) while I await the patches.
The USB-C Expansion Card is purely passive passthrough designed to minimize signal loss and voltage drop, so it depends on the capabilities of the specific mainboard. The current mainboard does support 40Gbps through that card. For Thunderbolt, we can't state anything yet until we complete certifications.