Exciting novelty after the point of PMF is good.
It's value to grow into from a strong toehold of PMF.
Novelty you can tackle from a point of strength is hard for others to tackle.
As a critical path to the point of PMF however novelty is strictly bad.
Everything depends on how quickly you can get to that toehold of PMF.
Novelty implies possibly compounding unknown unknowns, blossoming into a dark and dangerous jungle.