One thing that is different is that the X1/9 doesn't use Baulk Rings/Pre syncrhonizers as the Porsche does (blocker rings, in this vid they're cone syncros). I don't know how much better these make it, but pretty much every gearbox uses them from what I've seen - after watching the vid, oh yes.. it's better
Some reading material:
https://www.hoerbiger.com/upload/file/2013_basicsofsynchronizers.pdf
Which got me to thinking... gear lightening. I've noticed that Alfisti lighten their gears (I guess some Alfas used syncros without any pre-synchronizer rings). - I guess this would reduce the rotational inertia, and help slow down/synchronize the slider.. mind you, 3rd and 4th aren't very large gears, so I'm not even sure that it's practical to do so.
https://www.lesliewong.us/tag/lightening/
2 finger shifts is in my future.. maybe 3.