I disagree completely. Stacking ability-boosters are a staple of these sorts of games, known as RPGs by some, to he point that I'd dare say it's a necessity.
Bullshit, you can have an RPG without even having items to begin with.
Not to mention that the most popular and enduring RPG of all time, Dungeons and Dragons, works exactly that way, to the point where many bonuses don't even stack with spells of a similar effect, because the spell being permanently cast on the item is the source of it's bonus.
The idea doesn't exactly work for Divinity for other reasons, but those are mostly related to the system not working in the first place.
