You definition of zero trust can never include the endpoint devices. Those get to see everything you type on them, and have the same level of access to your services that its user has.

Instead, with a remote desktop you are only adding a bit more of vulnerabilities. It can never remove any.

(About those others, there exist some nice works about program portability, that culminated on fully distributed OSes, but those have no adoption. Instead, people prefer to hack distribution over the piles of hacks that are modern OSes. Obviously, it doesn't work well.)