This is the last time I will say this: nothing related to those "failed checks" are part of the mission objectives. None of them. You 100% the mission by delivering the package. You unlock an easter egg by taking a specific set of steps that are outside the mission and are rewarded with special equipment.
No-one said anything about failing the mission. Once again you're arguing against something that was never said.
I quite specifically said failing interactions.
You must fail the interaction, to gain the reward.
You can dress it up as an easter egg, or whatever term you wish. It's the shown mission reward, yet it's a reward only gained by failing something, so it's a reward for failure.
I'm sorry you seem unable to interpret this, but that's it. It's as simple as that.
100% success on all interactions = no reward.
90% success/10% failure = reward. (hypothetical %)
You only gain the reward,
if you fail the interaction.
If failure is the key to receiving the reward, then it is a reward for failure.
As there is no reward for 100% success (passing all interactions), it would make more sense for this to be what we get the reward for.
Complete the mission to the highest possible standard, to receive the reward/easter-egg.
That would be intuitive.
It would also be the same as the others, they are intuitive,
where you need high enough Perception for the old man to appear & you need high enough Charisma to succeed with Bikini Girl. This one you need to have low stats to fail, not high stats to succeed. Hence counter-intuitive.