I hope companion interactions and behaviours change in the full release. It is not fun dealing with annoying behaviours of companions. A unique background shouldn't always mean annoying mechanics.
At least, I hope they give us more companion options to chose.
For example, I don't like the vampire spawn being flirty in every interaction. It is not what I am looking for from an DND-like game but I like to have a rogue companion.
Any of you remembering Gascon from Throne Breaker the CDPR game? That character would be a perfect rogue for my playthrough in this game. However, sadly I need to deal with annoying Astarion!
Magic and rare item drop are good imho. In a game of slow progress you need good itemization.