The game currently has chest types for Weapons, Armor, Food, Consumables, and Resources. Runes don’t fit cleanly into any of those categories. “Weapons” is the closest, but they’re not really weapons, they’re more like spells.
I think it would be a wonderful quality of life improvement to implement a dedicated chest type just for runes.
I would say runes is a type of Resource for Weapons and other utilities, the same Runes are atleast stackable.
However i still agree with the point you have made just because i thought the same or atleast it felt like theres no category carpet icon that fits for it.
I would want Moon to even go further on this and add a library that automatically holds any rune you’ve extracted once, thus ‘learning’ it.
Think Guild Wars 2 as an example and how they handle cosmetics etc. I find the need to store runes already a bit dumb, if these are attacks we put on a weapon, aren’t they skills? Something that is stored in the mind?