I'd also probably order the 10G for that price if it was just a checkbox in the order process. But opening a ticket later (and downtime for the server), or waiting substantially longer for the server to be available isn't really an option for me. I'm wondering if they deliberately do that because their switches couldn't handle too many 10G servers?
but currently you can request it as referred here https://docs.hetzner.com/robot/dedicated-server/general-info...