The primary thing I'm going for in a commercial engine is platform targeting and stability. Some of the defaults are certainly "bland", but that ensures I can actually ship this thing to a meaningful % of the available market. Unity's coverage is so consistent that I've been debating using it for non gaming applications. There aren't many cross platform ecosystems that work this well.
Just a polite heads-up in case you weren't aware: for non-game usage of Unity, the licensing situation is... a little complicated. That goes for the engine as well as a lot of the stuff I've seen in the Asset Store. Just a thing to bear in mind, and potentially a reason to use a different engine.
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What are some things that you'd build with Unity that aren't games?
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