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Simplicity. Also maybe use Go for apps instead of Java.

The idea is it would be nice to have an OS that is a little easier to learn for the next generation of devs.

Simplicity how? It would require a great deal of complex work.

Simplicity in the sense that BSD is a much smaller codebase than linux and therefore less complex and easier to onboard new devs.

It wouldn't be a smaller codebase if you built an Android-like mobile OS on top of it.