Zed should focus on basics. When it focuses on basics Zed is good. https://github.com/zed-industries/zed/discussions/54150 failing to show newly created files and declining to provide a refresh button, instead adding a polling backend, breaks Zed on WSL. Why a new version control system? Why not git, jj, or another existing system?
There should be a concept called "engineering privilege". I see some companies do things that are widely out of their core product and engineers there just having fun with a bunch of different stuff with seemingly no commitment to bring in revenue. They'll re-invent/re-write things constantly, write a new compiler/package manager for their chosen language, create new frameworks, new open source projects unrelated to…
The same logic also applies for software that is used internally. It's not always that developers want to rebuild stuff, but that they need to rebuild or alter software to fit their / company needs.
We have not even talked about cost or licensing or other issues.