Hello guys. Hope all is well.
I asked a question in past about ROUTE VI like what's the tip.

Then some people advised me to listen the bass move but I don't think it works.

For example, ii-V-I or IV-V-I.
Both ii and IV share two notes A&F ,key in C for example, and they might play inversion.
Correct?

So here's my actual question.

Ideally, Do you have to be able to tell each chord's function simultaneously? otherwise you can't tell if it's D minor or F Major I think.

I'm asking because be able to tell multiple chords function immediately is pretty hard. Way way harder than chordelius type of training.