Currently making my own spreadsheet for weapons, frames, companions, and mods. I was adding the drop rate chances from each enemy to that mod and I come across names that were either taken out a long time ago or just don't have drop tables for these mods period like Verd-Ie and Primm, Hunhow and Erra, even the Old J3 Golem and Nervos, etc. It seems like a waste of space if they aren't able to kill in the game now.
As well some enemies have 2 drop rates for a mod, so it's pretty weird. The Terra Attack Drone and Terra Shield Osprey both have 2 tables for the same mods. But, having pretty much every enemy in the game drop the same couple mods is absolutely absurd just to put in when there is over 600 of them. I'm not saying it's bad but the Warframe drop tables seem a bit funky for this.