An idea for luck
So from what I have been told, luck only affects your chance of getting off the hook and bear traps which I believe this system could be really interesting and expanded on so here is what I am suggesting.
Let killers affect luck with perks and offering that would oppose the survivors luck maybe even as a status effect that could temporarily affect luck.
Let luck go into the negatives for some killer incentive and either giving bonuses for the killer or negatives for the survivors
Have luck increase the chances of skill checks appearing.
Have luck affect the item rarity or if the killer has made the survivor searching the chest into negative luck have a chance of no item appearing.
And a bunch of other stuff, feel free to add to this idea I believe its very interesting and could be expanded on a lot and have new interesting luck builds.