I get your point, but consider this:
Compare the level of credibility of a well-known and respected game developer and a modder/group of modders, but imaging making the comparison as an average player (not the one that knows that modding can do thing even better, sometimes).
People pay Larian to get the enjoyable final product, betting on the high level of credibility of a game developing studio. Imaging the player then getting all hyped to play a ranger and having a completely shallow experience playing it, because Larian decided that balance and all around rewarding experience is not a priority against copying 5e raw.
I can assure you playing a 5e ranger with a good party and DM isn't a shallow experience. Your build isn't everything. I often go dual welding as a (drow) ranger despite it being clearly suboptimal.
