Zed spent their innovation budget on Rust and GPUI, and as a result they have no energy to question the status quo of IDEs as a whole. Git and LSP are antiquated but form the bedrock of their plans for the future.

Essentially at this point they can only do spaghetti enigneering: adding more and more complexity on top of the complexity that already exists. IDEs have been through so many iterations of this process already that all the real wins are in refactoring: moving the whole system (and ecosystem) design sideways, which is he one thing they dare not try to do (though it happens to be my forte).