Yeah this is one fundamental reason I don't see MCP taking off. The only real use cases there are will just be built in natively to the tools.

Yes, they could be, but then you 100% rely on the client tools doing a good job doing that, which they aren't always good at, and they also have to reinvent the wheel on what are becoming essentially commodity features.

E.g. one of the biggest annoyances for me with cursor was external documentation indexing, where you hand it the website of a specific libarary and then it crawls and indexes that. That feature has been completely broken for me (always aborting with a crawl error). Now with a MCP server, I can just use one that is specialized in this kind of documentation indexing, where I also have the ability to tinker with it if it breaks, and then can use that in all my agentic coding tools that need it (which also allows me to transfer more work to background/non-IDE workflows).