Over half of the big subs are still private/restricted that were part of the blackout.
Generally you either go into a group with farming in mind, or play for any general build.
For a weapon that can kill a large number of enemies, but also slash proc. Idk of any weapon that can fulfil those requirements without a riven off hand while being SP viable. Maybe Kuva Kohm?
I'd honestly say just use any weapon that is good, if you kill enemies fast enough for general missions you will desecrate enough if you are wanting nekros for something like survival.
Warframes: Energize, an alternative is the Emergence Dissipate which is super nerfed, but it's more farmable than energize. I'd say the molt arcanes are also all good as they're stat boosts.
Operators: Magus Elevate or Magus Repair are both good as they allow you to heal your warframe. Repair heals % over time, but Elevate restores a flat amount. Repair is better for frames with more health, but I'd say repair is better overall.
I'd say Inaros is best for hijack, he can be nearly immune to all damage due to armor/DR and with arcane grace he is constantly at full health while driving the target. Since he cannot have shields, he drives the target with health instead.
Rhino can do the same thing, he use to be the interception frame before nezha came out. Longer range, but lower duration. Useful for when you have a bigger map that Nezha can't deal with.
Such an annoying grind for such a sub-par weapon.
I'll never understand why the put the warframe/weapon preview behind opp. 4. I'm glad it's in, but why put it behind a rank cost at all?