To my knowledge Microsoft is not a painter’s company. Steam does it, Epic does it, Google does it … Even Microsoft does it when it comes to Windows Update.
Again, the issue isn’t size per se or bandwidth per se but the mismatch between the two: or you do small updates with a small bandwidth, or large updates with a large bandwidth, but certainly not big update with a small bandwidth. When you launch the game to play, you can’t be happy waiting about 20h before you can use it (not to mention that many updates break working things to make other things work…that’s another question).
I bought this game to “fly” and not to download stuff. It is not acceptable that since its release I have spent twice as long downloading the game and its updates than playing with it.