You already had them in the drop pool in the previous driftsmelting event, it makes no sense to backtrack on a change like that.
Despite driftgems being drop pool in the last driftsmelting event the current event seems to have no plans of dropping driftgems.
Last driftmeld bonanza was a part of 1.5 yrs anniversary event.
This upcoming bonanza is no special occasion at all, like a very periodical monthly-bimonthly event.
I understand that but there shouldn’t be a special occasion needed for such a feature, most people dont even get a single event skill even after grinding the whole event. The rates for gems weren’t even that high anyways so there’s no reason they couldn’t do it for future events.