Firstly, Frodo is obviously not a STR character. Duh.
Secondly Gandalf followed the Balrog down a frickin' mountain, fighting him all the way as fire licked at his flesh, before fighting him back up the mountain to the very top. Clearly Lord of the Rings has room for Heroic Fantasy as well.
Gandalf, however, is not even a mortal being. If I remember my Tolkien lore he is closer to materialised celestial being. His D&D equivalent would be Elminster, not some dirty adventurer. He wouldn’t be a player character but a wise mentor who gets removed from adventure after providing tutorial and safety of the player.
If Larian intention is to tell a superhero story, I still don’t think it comes across. And let’s be frank - all games are likely to present their characters as more capable as they should be. BG3 just goes very, very over the top. If I thought it makes for good gameplay I might be more forgiving, but I don’t think that.