I don't benefit from syntax highlighting and don't see how anyone does. It's pretty, but doesn't convey useful information that isn't already right there in the syntax itself.

It's not just purism. IDEs tend to have workflow problems that distract from focusing on the code. I'm increasingly using Codium (open source VScode) but there are many papercuts that prevent vim-like workflow that integrates well with shell and the filesystem. Also vim's "dumb" autocomplete goes quite far, especially when used with the well thought out split-panel implementation.

IDEs tend implement features quite ad-hoc without thinking how they compose which limits the workflow to certain style that's not always very ideal.