Just curious but wouldn’t a Mac Studio paired TB4 PCI-E expansion board/dock fill this same purpose? Is there something inherently in the Apple ARM arch preventing this? I’m still on a Intel iMac where such a solution works a charm, so my natural upgrade path would be a Mac Studio and display. Of course you are still limited to your thunderbolt bus but I guess TB4 is good enough for a lot of PCI-E use cases.