[giaour]

> - can run individual tests seamlessly

This is the main one for me. If I am working on a large project with decent unit test coverage, the feedback loop in IntelliJ or Visual Studio is just much quicker than the alternatives because you can run and debug the specific tests you need.

[j_w]

Why can you not run specific tests from neovim?

If you really wanted to you could add some trigger on save for a file that would re-run tests for said file. Maybe a plugin or key bind could run a specific test which you choose in buffer.

[giaour]

I'm sure there is a way to use a step debugger with a specific unit test in Neovim or whatever, but it's one of the things heavyweight IDEs do with no setup or configuration.