So we can expect more "build items" like the Headband of Intellect. I really hate these items for several reasons.
- If I make an Eldritch Knight with 16 Intelligence, I want to be rewarded by stronger spells. A Headband of Intellect punishes me for it. I wasted those points on Intelligence when the correct build is to dump Int entirely.
- Your character's ability scores should always matter, rather than being overwritten.
That's a 5e issue.
There are about 27 items in the DMG alone that overwrite or adjust a player's stats.
5e shifted focus from magic gear into characters and their abilities
That simply isn't the case.
There are a myriad of items in the DMG that allow your character to do things outside of actions that their character's class or abilities would allow.
Larian said initially that magic items would be faithful to D&D i.e. rare and impactful.
Larian has never said anything about items being rare.
There is no 5e standard on loot rarity or impact, those things are entirely DM dependent.
5e has guidelines for high magic, medium magic, and low magic campaigns.
You seem to be conflating your preference for a low magic campaign with how 5e actually works.