FOSS gamedev and creative worlds

Well I've been wondering for a while, why are there regular Minetest versions and then theres MineTest builds, what's the diffrence?

Well, not every build can be made a release.

Builds are the developers way of giving us a sneak preview and a chance to mod, and offer help with the latest project that works(96%). Releases are finished, done, no improvements no rethinking, or anything. Plus releases would make the developer proud, builds are a way of including you into what is current, unfinished,and unpolished, with problems, and stuff like that.