I'm genuinely hoping that this is just an early beta omission because, contrary to the very limited use-case presented in the article (iPods) Firewire is still

I'm genuinely hoping that this is just an early beta omission because, contrary to the very limited use-case presented in the article (iPods) Firewire is still an essential part of many professional workflows: an enormous amount of very expensive high-end music-studio equipment uses Firewire, as well as film scanners such as the CoolScan range from Nikon, that still outperform camera scanning - even using modern 'medium format' cameras like the Fuji GFX100. Replacing that equipment would be extremely expensive - disincentivizing buying new Mac equipment.