If I have a game downloaded digitally on my Xbox One and then go and buy a physical...

Going all digital on xbox one won't have any great benefits, unless Microsoft makes digital downloads on the marketplace more competitive to buying physical.

Ok, then why do i have the option to buy a digital copy of each game, including Gears 1 and 3?

If i go to the store on my xbox one console, i have the option to buy the game.

So i can buy them from the xbox store but i cannot use a redeem code for them.

Also, when inserting the Gears 1 disc, it downloads the digital game on my xbox one as per the console's requirements.

Where does that download come from?

If you use the physical disk you are only downloading the emulator patch

Not the game

Agree with original poster I like buying physical games also and for years have seen no reason that buy a decent laptop but if I could play my physical disc xbox games on a good spec laptop I might be tempted to buy one for the games on the move but I won't
go digital for this feature

I brought my Xbox One with two games, well one of them was bundled with the Xbox One. One game was digital and the other was physical media. Now I liked both games and had a lot of fun playing both, but I spent more time playing
the digital download game because all I needed to say was "Xbox, go to". I would love to buy most my games from the Xbox Marketplace, but I'm not willing to pay more.

Hello, i have checked the version it is Mine Craft: Xbox One Edition v1.58.1920.0

Did you buy the physical disc version of Minecraft: Xbox One Edition? Or did you buy the digital download version?

If you have bought the digital download version, simply download the "Minecraft" without the "Xbox One Edition" from the Xbox Marketplace for free.

If you have bought the physical disc version of the game, your only option is to buy the Minecraft version without the "Xbox One Edition" in the title to be able to get the Aquatic update as well as the Cats and Pandas update.