Minetest is a game engine. This package "Minetest Game " is like a demo world, not a fully featured game. Don't judge the capabilities and potential of the Minetest engine based on this demo package. To do this is similar to downloading Unreal Engine, starting up a sample project with the demo player and demo map, then throwing up your arms and saying "this game sucks".
What you can do you use Mintest Game as a base to further mod the game into whatever gameplay experience you want. If you're not into creating your own mods, there are plenty of community-made mods that you add on top of Minetest Game to tailor it into the gameplay experience you want.
If you're not into modding whatsoever, and just want to play a game, then check out packages that are intended as fully featured games, like MineClone2, NodeCore, Exile, etc. Enjoy.
ver nice. I like how you implemented this as a separate tab, and ensured you have to empty the bags to be able to drop or swap the bags around. will this work with quick crafting / gridless crafting mods? like rubenwardy's [crafting] mod? for example, will his mod know the presense of items stored in your extra bags in order to give players ability to quick craft an item?