Their controller uses AAs so it's easier for m$ to push PC kits.
It's cheaper for m$ to include un-rechargeable batteries with each console rather than rechargeable batteries.
m$ makes more money, if the PC kits are labeled as accessories rather than bundle essentials.
You're 2nd sentence makes a lot of sense.
If they did what you said, m$ would be basically forfeiting the opportunity to increase their profits.
Yeah, I should edit that second sentence to: "Wouldn't it be better for the consumer ..."
Yes it definitely would be, but it would be bad for m$.