To be fair every class pools and spends for those occasions too. If they can.
We'd also have to consider rate of acquisition, you don't want to waste a share because you needed to move etc. My bigger concern would be the artifact trait for 25%chance when UA finishes to affect the target again. Will it be worthwhile numerically to wait and see if this procs? Do we only chance it when we have the double passive buff from artifact? Does that even effect that node? Etc