As always, I seem to be the odd one out (again 🤷‍♀️): bass in the center, kick and snare center, lead vocals center, and everything else panned hard left/right.
So far, no one has complained about my mixes, at least not about the panning.
But I only make pop/rock music.

If something in one of my songs doesn't _seem_ to be panned hard L/R, it's because it's a stereo recording (e.g., overhead microphones) and the instruments are placed where the recording engineer positioned them during recording.
But, by definition, stereo is always panned L/R.