Comment by dmonitor

Minor tweaks are still a mod. Gameplay overhaul modpacks that turn the game into Factorio are definitely the a small minority of the playerbase, but anyone who knows better plays with at least some sort of client-side performance mod (Optifine, Lithium, etc), and that's been true since before 1.0.

Etho's dedication to keeping a purely vanilla singleplayer world is a unique feat. If you want to use Hermitcraft as an example of the median SMP, their modlist is actually quite large: https://github.com/henkelmax/hermitcraft-server

Minecraft simply has a lot of areas for improvement that haven't been touched by Mojang for one reason or another, and a big reason why people stick with Java is because the community has built an ecosystem to tweak the game to their liking.