This is one where I'm siding with Larian. Bring on the treasure hunt. Gimme magic loot.
This is true to the spirit of BG if not DnD. BG 1&2 had soooo much stuff you needed two bags of holding to carry it all. It's just something that will be true of any videogame adaptation of D&D rules: many more magic items and many more fights than you would ever see in a campaign.
And putting Larian's additions to D&D rules into magic items allows anyone who dislikes to just ignore them.
Judging by the cover art and the name I suspect the full set of lighting items was designed for "Gale" -- I'd rather have those rules put in this way instead of creating a new elementalist mage class.
