Minecraft Microsoft Windows 10 Version Not Compatible with Mojang Version, Or does not offer the Mojang Version Free Like it offers Microsoft Version Free? If you purchase Mojang version first you get Microsoft, But if you get Microsoft first... You have to buy both??? That makes no sense. Please Help.

What I expected to happen was...:
After buying Windows 10 Version I expected to have Minecraft for Both Platforms. (Like Microsoft offers Mojang accounts "If you have a Mojang account and Purchased Minecraft, New or Old, Get a Free Windows 10 Version"

What actually happened was...:
After purchasing Minecraft Windows 10 Version I was only left with the option of using that version instead of both like is offered the other way around? It should work both ways..?

Steps to Reproduce:
1. Buy Minecraft Windows 10 Version on the PC Microsoft Store.
2. Be Ready to become flustered when you can't play with friends on Minecraft Mojang, And It's cheaper to buy the Mojang Version???...