Add-on Saving
Have devs ever stated a reason or reasons as to why Killers can't save their used Add-ons by doing really well in the trial?
I always figured it's cause Killer Add-ons would just be more powerful in comparison, and that's why. (Though that would go against the whole "Killers are in the minority so they need advantages.", but whatever.)

Comments
Killers addons more powerful?
That is debatable
Its one of the reason Killers typically get more BP then the average survivor to compensate for your Blood-web spending.
They did state a few Dev streams ago that they are looking at ideas to better balance the survivor/killer economy for items and add-ons.
Oh okay.
doctor: Pretty much useless without good add ons
nightmare: terrible in general but pill bottle and z block make him not so terrible.
trapper: in my opinion without bloody coil, iridescent stone or a bag/sack trapper is not so good
wraith: not so bad without add ons but the ultra rare clapper and Windstorm(not both just either) really help him
huntress: charge add ons are not needed but really help
hag: haven't played her yet but from what I hear the add ons that increase teleport range are a must
spirit: not anything specific but without add ons she is pretty bad
Cannibal: faster charge speed is very good and in my opinion needed to have a decent chance on some maps.
the rest I don't think need add ons to do good.(or aren't good with or without add ons)
i do think killers should have a way to keep add ons after a win seeing how reliant some killers are on add ons. Maybe if you double pip you keep add ons?
The main problem people mention when that idea is suggested is that, if you for example double pip because you used high-rarity stuff, you'll get to keep using it for the next match.
And then repeat that over and over and you'll never have to buy new ones again.
I'm not saying i agree or disagree, just that it's a thing that was said before.