If you look at one of the studio sessions between Drake and 40 (look up "100gigs" on youtube), there's this flow between the two, almost like an implicit language that they invented together, that lets them collaborate at an insane speed.
The problem is you need to fully trust your collaborators, and that's really hard to find in this industry. Most people never find it. I haven't.
I've seen it though. It exists. Very rare. I know two guys who used to participate in Ludum Dare over 10 years ago who would have loved something like Zed if it existed back then.
By contrast, at your 9-5 where you don't know if your coworker is gonna stab you in the back for a promotion (which I suspect is most people in the comments here) then Zed is probably not a great tool. Git would be a better fit for that. After all it was made to develop Linux, which is one of the lowest-trust collaborative environments out there.
For me it's less about trust and more about practicality. If you are coordinating live in person while collaborating that is a bit different than trying to edit a doc multiple people are in, all remotely. When I had said it's not fun that's the case I had in mind.
Linus actually mostly deals only with trusted subsystem leads. They may choose to deal with less trusted contributors, but I wouldn't say the Linux kernel development process is low trust. Many of those folks have worked together for decades.