The bigger issue is that this place sounds like it has insufficient or otherwise incompetent management, which will inevitably create issues like this downstrea

The bigger issue is that this place sounds like it has insufficient or otherwise incompetent management, which will inevitably create issues like this downstream. I'd bet that if you looked in other departments at this company, you'd find similar role confusion/dysfunction. Someone doing big IT projects cannot be expected to also do desktop support at the same time (and shouldn't become the de facto support person simply because they have technical knowledge).