It's definitely an important aspect of the character/sound, especially when it comes to using the Vintage Mode / Slop, or other per voice variation (ie: Poly LFOs in different phase).
Repeatedly hitting the same key with the classic P5 voice allocation gets the same Oscillators and Filter re-assigned each time, vs Round Robin where each consecutive key press on a single key cycles through the voices... giving potentially a slightly different fine tuning, filter cutoff, and env ADR stage timings.
Would be nice to have on P6 and Rev 2 and other instruments... It's awesome that both modes are available/switchable on P5. Also, Polybrute has several classic/modern voice allocation selections, which I've been enjoying experimenting with.