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> (eg: projectile vs project.el).

Always curious of why you prefer one of the other. Any major thing you prefer projectile? (only ever used project.el here and was satisfied)

Similarly, I'm using ivy, first time I see vertico which looks similar.

It has a working switch to cpp/hpp function that you cant really get otherwise. Thats the only thing I miss from projectile.

This is actually a builtin feature of Emacs, and is available regardless of whether you use projectile or project.

Try `M-x ffap' whilst point is on an include directive's filename, or `M-x ff-find-other-file' to jump between C/H header files.