It's a game first and foremost, and it mostly works, quite well, with multiple players. It's a completely different set of requirements from safety software.
And people write mods for it and have had success. If that is not solid what is. For real what's so bad about minecraft, it even runs on a relatively old laptop of mine with 8 gigs of RAM without any lag.
In most safety software you can't even use dynamic memory. Maybe a lot of the software we write in that domain would be considered "bloat" in others, but I don't know what are the constraints that Minecraft faces that drove it to be implemented the way it is. But despite the bloat, they managed to do a lot.