I realize all we are doing is the exact same thing we have been doing through out warframe just in a different way. I don't think 5 endless missions (make that 4 because the other one was abandoned and there is still a HUD issue that is impossible to work around) is going to interest me if all your telling me to do is to do it for longer, and if you die you have to wait to be revived through a boring mechanic.
Oh right the invincibility drones? They were just a mechanic slapped on the side which were not really that interesting. You kill them boom: everything is dead, you don't, well It doesn't matter because you will anyways because of two weapons (and a few others) that dominate all in passing through enemies. And I know what this sounds like, said weapons are overpowered. They are not, its just their design.
The problem is, is arbitrations are just not engaging. I understand rewards that are very exclusive may engage the player but the reality is, is once they have just had enough of the arbitrations because of how slow or how just uninteresting they are, they just don't give a damn about them, it took me like a long time just to get that ephemera and than a whole 3 days to build it only for it to replaced 3 days later by the cooler stalker smoke ephemera that was a piece of cake to get and build. And now that I see arch-gun rivens and aura forma, I just left and played the game, I play when I have nothing to do. I mean all I see in an arbitration that is unique is the drone, which is the least challenging thing ever, We could use an added objective in the mission to do. The mentality I am going for is the objective has to be more interesting than just killing a drone (I guess I am suggesting a raid or dungeon like structure, without the requirement of certain frames, weapons, focus schools etc), like in the kuva survival (Though don't always try to make it defense, I am starting to get bored of it), but in saying so one problem I had in kuva survival was the fact that towers didn't scale, so enemies would nuke them at 20 mins and beyond, So if you do implement additional objectives make it friendly for a little bit more than just "defense warframes" etc and do try to make it less of restriction or something that does not hassles the player like how arbitration survival only rewards about 3% support per capsule picked up.
And one last thing, arbitration boons are okay, they can be fun but most the time no one uses them, and even still I don't, unless it's a warframe I really like or will not die as others do. At high level, I would say 30 - 40% of warframes are basically paper being thrown into hot water.