Confidence is a quality Fëanor has in abundance. How much of it is justified is a matter of debate.

We're so not speaking of the last mission. Not now, hopefully not never.

"I think there's little that can seriously threaten Iron Man but you need not trouble yourself, I will. Besides, you can use palantír to contact us whenever you wish."

That might prove difficult given how the unknown force suppresses any and all spiritual powers. But they don't know that yet.