No one at lvl 70 will let his buffer being afk in serious party because now with his spin or kidbuu he can do real damage.
with kidboo he deals around 800-1k per hit and only can use it for one run since others will lose their buffs, and he has to rebuff. And spin deals 50-60k damage over 12 seconds with an exhaust after that and compared to others damage thats nothing.