Being in the military and your section chief wants you (an E-3) to give a brief to an outside section
Nowadays? I think you mean since always :)
New War was fun, as a story mission. Veilbreaker missions though... they have a few problems:
They're repetitive. They were fun the first few times, but having to do the same 1 of 3 missions every week is borrrrrinnng. Yes WF has a lot of repetition, but there's ways to mitigate that, mainly by changing up your frame/weapons to constantly have a different experience. VB doesn't have that.
There's no customization. Warframe is a game all about customizing your appearance, your loadout, your builds... Kahl has... well, appearance. But there's no way to change up your experience. It's always the same gun every single time. Literally has 0 variety.
It's clunky. Warframe is about speed and fun engaging movement mechanics. Yes Grineer are not Warframes, but... that's kinda the problem isnt it? Who wants to play as a boring clone who can barely jump after playing as a ninja supersoldier god that can spin, roll, fly, etc...
Progress is ass. If you care about getting a shard every week, then you need 90 tokens. You can only get tokens from doing extra "challenges" and the max is 110, so you effectively have to get all but 1 challenge every. week. This is time-consuming and tedious, since most of the challenges are things like "find the stuffed animal." Man fuck off, I'm here to commit warcrimes, not look for kids toys. They need to make it so kills give you tokens too (in small quantities) and the challenges are unneeded but helpful boosts. Token prices may need to be adjusted for this, but the important thing is that you can earn progress by actually playing the game, rather than being annoyed that the enemies are bothering you while you're trying to help PETA find one more dog to set free.
I always assumed it was because they had the most pain-in-the-ass shells...