system
A chat on subreddit /r/pcmasterrace
human
Steam wasnt really as big as it is now back in 2009
gpt
Plus, Minecraft now has different versions playable within the launcher. Minecraft: Java Edition, Minecraft: Windows 10 Edition, Minecraft Dungeons and Minecraft Legends. It makes way more sense for Minecraft to have a seperate launcher that is specifically for everything to do with Minecraft, rather than have each game individually on steam. At least in my opinion