I really don't understand how this is so hard for JetBrains.

Build a polyglot IDE that blends the agentic workflow (terminal chat sessions) with the power of an IDE. Index specs and code so that I can jump from specs to implementation and vice versa. Keep indexing all problems found in the project, with a simple "Ask agent to fix" dialog. Expose debuggers with Markdown output to agents via skills so that they stop trying to debug via logging. Keep the nice UI for build/debug/run configurations, which are still hugely important for reviewing PRs and acceptance testing what the agents are giving you. Upsell by charging to host JetBrains-cloud-isolated-agent-workspaces, like what it looks like Herdr is going to do, so that you're not limited by what you can develop solely on your machine, and development continues after you close the lid, and you can review the output with your teammates in multiplayer, like where Zed is going.

Is it really that hard?? It seems so obvious to me.