Celestial Avatar From
Because they probably didn’t want it to be a 3rd permanent skill bar. More a temporary one that was strong.
It mirrors how they initially wanted elite skills to be viewed. Game Changers. Its no coincidence that the best elites are typically 90s or less and the most obnoxious/lame ones are 3min cooldowns.
CAF skills are obnoxious right now aided by their low cooldowns. Health bars zip up pretty fast in a 5second window with skills that are not tied to the 2 main skill bars nor any of the utility slots.
TL:DR
Its probably the last remaining throttle to druid being the excuse for the current dh, herald, chronomancer imbalance.