[Sylos]

What's more, almost all content in Minetest is implemented as a mod with this Lua API. So, you can really do essentially anything you want. Changing a crafting recipe or what a block drops when mined, is a matter of five minutes. Don't know the scope of Teachcraft, but I doubt it's as big.

And also in my opinion really important, is that Minetest is a real thing. What you're writing isn't some elusive Scratch project that you're gonna find several years later collecting dust on your hard drive, nor is it some Python thingamabob that you've glued onto Minecraft. Your mod is something that you can use as long as you're using Minetest (which itself is something that you will always be able to use, as it's out there for free) and your mod is something that you can post on the Minetest forum to share with others. That, at least to me, makes a huge motivational difference.