Can activated abilities be used during combat/showdown if the state is open and it's your turn?

Ruling: During a showdown, only Action and Reaction abilities can be activated. Regular activated abilities (without Action or Reaction keywords) cannot be used during combat/showdown, regardless of whether the state is open or it's your turn.

Nuances:

• "Open state" and "showdown open" are different things - activated abilities require a neutral open state, not just any open state
• Reaction abilities can be activated during closed states as an exception via the Golden Rule
• The rules for activated abilities don't change based on what card type (unit, gear, or legend) has the ability - all follow the same restrictions