The expansion in the devil fruit lore just sounds like slightly less vague explanation than before. Mother sea hating devil fruit users was already there, now Oda's just including that it's for them gaining abilities bred from people's desires, nothing too wild in my opinion. I like it, I was always kinda on the "keep devil fruits mythic" train in contrast to those that wanted a full-science explanation. I'm cool with Vegapunk figuring things out but I prefer things staying mythical and him just exploring the mechanisms of the fruits.