In the Java Masterclass you can learn a lot, but in Project Orion, he only promotes his Foundation. You can’t learn anything there without becoming dependent on this AÜI. Besides, this API is crap and he doesn’t even follow his own criteria, which he tells us in the Java Masterclass.
Thanks for your review. You’re right, we pushed our own build system into teaching coding in the Project Orion 1.0 version, however after much feedback from students we decided to make this optional in Project Orion 2.0.
You will be able to follow the barebone Bukkit/Spigot without using our library in Project Orion 2.0 which you have been upgraded to for free!