I guess the situation is similar to containers and static linking that got popular for server deployments quite recently. They allow to develop, test and deploy

I guess the situation is similar to containers and static linking that got popular for server deployments quite recently. They allow to develop, test and deploy your application with its dependencies in the exact same version - the exact same binary. Although usually this works just fine even with minor differences in the dependencies, a lot of developers deem it worthwhile to preclude such issues. If you now use ARM in production, you can't use the same binary file anymore. There might be different implementations depending on the architecture in some library you use. Also even with higher-level languages like Java it is possible to observe ISA differences: e.g. memory ordering.