I agree with you that the Lore challenges need adjusting - some of them are extremely un-entertaining luck based grinds. (Currently 7/25 Mike kills… After 13:38 playtime with WF. Compared to Ambra, with 2:55 whose Lore I’ll have completed after one story mission at this rate. And where’s my all Eldrid team at? Oh, it’s not coming? Well, shucks.)
That doesn’t mean we shouldn’t have patience. This is in no ways a top priority subject like bugs, glitches and exploits. The Lore Legendaries really aren’t that important, you’ll do just fine without them. You can already check the characters Lore from outside sources if you really want to. Other stuff you get from completing the lore are purely cosmetic.
Of course it would be great if they were adjusted right now, but GBX has stated that they are looking into it based on feedback and statistics, which they might need more time on.