Knock eats a level 2 slot. I can use that on something offensive. Or Misty Step. Plenty of other important things. I don't long rest every room.
But regardless, it has nothing to do with the scroll thing.
I'm giving you what I believe to be Larian Logic. It's like Bethesda Logic, it just works �.
They don't want you to feel pressured to bring a caster or cleric or whatever. As it is, not many divine spells are scrolls. Which is fine.
They already have mind read and feather fall, jump and heroism and barkskin and whatnot potions.
Plus what scroll you get tends to be random in loot and vendors.
They've got a reason for what they did.
I am confused by what you're saying here.
The point is this: You absolutely do not need Astarion on your team for lockpicking. Having someone with high dexterity, and who has expertise in lockpicking, is great if you want to
1. Open every lock
2. On the spot
3. Spending no resources
4. And not having to rely on gear
However there area TON of different options for you that makes Astarion's level of skill in lockpicking unnecessary. Yes, you might have to OCCASIONALLY burn a level 2 slot on knock, but if you lockpick what you can and use knock as a last resort, it hardly means you will have to long rest in every room.