I disagree with Linus here, in large part because modern system architectures are so distributed. There are so many parts of modern deployments which are not developed in-house anymore. Databases, organizational productivity software, monitoring systems... the list goes on.

So let's say the developers of PostgreSQL or Prometheus or JIRA or Mattermost or any one of numerous others were to come to their audience and say, "we support ARM 100%, you can run our software on ARM in production with no issues, and in fact it's the favored deployment model because it'll cut a significant slice off your operating costs." Does Linus seriously think that, what, customers aren't going to run ARM servers because they can't run the vendor's binary on their development machines?

Maybe there's a chicken-or-the-egg problem here. But just off the bat, PostgreSQL and Prometheus are both supported and built for ARM. There are non-official binaries available for many other projects. Developers are using cheap Raspberry PIs as local desktop development platforms. The more development the ARM ecosystem sees, the easier it'll be for enterprises to justify moving away from x86.