As a couple of others have mentioned, the original split between the original Java Edition and the now Bedrock Edition happened in 2011. This is several years prior to the 2014 acquisition of Mojang by Microsoft. So while Microsoft may have had motivations in Mojang promoting or expanding Bedrock adoption, that train had already left the station by the time Microsoft entered the picture.

Bedrock started as "Pocket Edition". Probably the best place to get the story is at: https://minecraft.wiki/w/Pocket_Edition

I like Minecraft quite a lot and am not concerned with interoperability between Java and Bedrock... but will only play the Java Edition because of game-play differences between the two; differences in which Java Edition comes out as being materially better than Bedrock... at least from my perspective.