Oh well. I am not much into 1st person perspective. But I think I know why CDPR decided to make Cyberpunk 2077 like this.
Remember when there was the whole debacle of The Witcher 3 VS Fallout 4? Where Fallout 4 defenders would say stuff like "We can't compare both games. They are too different from each other!".
Well, I guess CDPR decided to make a challenger to Bethesda's Fallout games. A sci-fi, first person, shooter, action RPG.
After all, everyone kept saying that Bethesda is all alone in the type of games they make. So maybe CDPR is trying to make a game series in the same "type" as Bethesda's, but in a way that will blow the competition out of the water. It is trying to prove that there is more to those games than just "walk, kill, loot, repeat".
Not to mention, Fallout 4 was a critical success in sales. So the market for games like this is there. If CDPR can get a slice of that pie... Well they would be crazy not to try.