Maybe you should tell us about your character, which build you are using, the level they are on and most importantly what your gear is. The Pre-Sequel is a lot easier than BL2 thanks to a milder scaling and characters themselves being a bit more powerful overall so there are some other issues to be addressed here.
Iwajira is a horrendous source for Legendaries anyway. The Hail it drops is really good but too awkward to use for many people. I haven’t seen a single Thingy ever since I got the Handsome Collection and I do check everything.
I find a lot of Legendaries in Vendors (a lot meaning like 3 which is a lot compared to BL2) but I do check them every single time so there are a lot of chances. Bosses have a great chance to drop their Legendaries now but 1:10 still expects you to put some work into it. Additionally, there are FAR less bosses with drops in the storyline compared to BL2 once again. If I do farm them I get what I want in about an hour at worst. I usually don’t get a Legendary without trying during a playthrough because of that low number bosses.
But really, I never even needed the Legendaries. If they are fun to use I’ll farm for them but I often get them just from exp farming Red & Belly and the Bosun to stay with the ridiculous expected level.
