Minecraft: Java Edition has been obfuscated since its release. This obfuscation meant that people couldn’t see our source code. Instead, everything was scrambled – and those who wanted to mod Java Edition had to try and piece together what every class and function in the code did.
Modding is at the heart of Java Edition – and obfuscation makes modding harder. We’re excited about this change to remove obfuscation, as it should make it quicker and easier for modders to create and improve mods. Now you won’t have to untangle tricky code or deal with unclear names. What’s more, de-bugging will become more straightforward, and crash logs will actually be readable!
surprisingly fantastic and consumer friendly move from mojang, good on them
Modloaders also mainly exist due to the onerous terms of any mojang/minecraft API for java edition that would exist - Forge/Fabric/etc… are designed to rip open the game and then stitch it back together with the desired goodies. Anything official would probably still have strings that would bind the modders, so modders won’t embrace the system wholeheartedly (similar to how datapacks can’t replace mods).