D&D 2nd edition is 8-18 (regularly, with overstep to 25). 10 points, looks familiar.
Also, it was extremely scarce on giving stat points... so your point with D&D is...?
Tell me what other ability will give the same boost as +3 to a stat... heck even on multiple items on your idea. There is none, indeed.
There are tons of way to balance GOD ITEMS. Uhm, nope?
2e never gave you stat points at all. Want to get your wizard to cast 9th level spells? Better hope you roll 18 Int, plus your secondary stat. It's actually even a plot point with a Thayvian Zulkir in the Villain's Lorebook, who was seeking ways to get that vaunted 18 Int. Larian's using a hybrid of 2e and 3e, with ability points and feats plus stat caps.
And I have a level 15 amulet right now that gives +2 Str, +1 Int and 30% to two resistances and +1 loremaster. There's a fire skill that gives +2 Perception too.
I even mentioned gating items, so that only the most powerful items from the highest level characters could benefit from the most powerful enchantments. Christ on a stick, there's already a talent that gives you free healing when you hit something that bleeds, and up to 50% to all resistances except tenebrium, and you can get that by level 9 or 10.
If you want to talk about OP, then look at the talents and crafting possibilities in place. My Sword of Holy Flame, smithed with 4 BS, is vastly more powerful than anything I've ever found in game so far.
All Larian has to do is decide how they want to handle crafting and how to gate items with regard to Blacksmithing and crafting. Or, hell, just ignore the +3 thing and have higher level crafters be able to put random status effects on weapons.
