Yes you can deploy a lucky crit but you can't guarantee a crit, and its not really ideal to fish for one either and its a 2 minute cooldown if you do get that lucky crit. Meanwhile aspected helios is nearly a non critical adlo spread on demand.
Sure yes we still have a crit adlo but you cant really use that as a defense when single target its only saving grace is its heal is slightly more potent and the omg it actually crit moment. Not to mention the mp cost difference.