This is my first time posting, so criticism on how stupid or awkward this might seem is greatly appreciated.
I just wanted to share my opinion on this "space ninja" theme this game is supposed to have. If anything, the Tenno are more like space pirates. We board ships, kill everything on board, and loot and plunder. Stealth is a very counterproductive mechanic, and it needs to be updated. Stealth attacks don't yield consistent kills, and it isn't possible to stealth attack and successfully kill shielded enemies (as far as I know). Most of the weapons in this game aren't stealth-oriented. We only have 4 silent primaries, being the Paris/Paris Prime, Dread and Cernos. We also only have 3 silent secondaries, being the Kunai, Despair, and Hikou (the Ballistica is a low-awareness weapon).
As for spy missions, I think that DE should change it so instead of taking data things off of the ship, we should eavesdrop on high-ranking Grineer. This can also contribute to a more in-depth campaign that I see in the featured poll is very popular. They could be placed one mission before an assassination to learn where our target could be.
If DE doesn't make changes somewhat similar to this, I don't think the Tenno could be considered space ninjas, but rather space pirates. I saw once in the comments: "We aren't space ninjas anymore, but we are mercenaries that suck the dick of the faction with the most credits.". But, they can also embrace the idea of space pirates and make a pirate-themed Warframe?
Please, don't hate. I just wanted to share my honest opinion on stealth, space ninjas, and spy missions.