I wanted to highlight a particular chord of my previous question because it was bugging me a bit. What would you call a dominant triad over a subdominant bass, in pop/jazz roman numeral analysis? It could be seen as a
V7 in third inversion, but if you have a strong subdominant bass it doesn't really sound like it. But just calling it a
IV seems... meh. Especially because we call the inverse, a subdominant triad over a dominant bass, a sus chord.
Update: Thanks all for your responses. As most of you have said, roman numeral analysis isn’t really suited for these kinds of chords. I might decide to just slash chords for bass and then come up with a different way to notate secondary chords and modulations in a functional manner. I don’t want to do this literally because that doesn’t make sense in a tonic-agnostic notation.