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Is there something elementary missing that is a must have for that price?

No, that`s some question of saving money. You have to have the money first. And for me personally it`s not possible to spend 1.5k Euro into "some features that I don`t really need for prototyping". That`s why I worked with A5 Extra, A6/A7/A8 Commercial and not with the pro edition for years. And that`s why I`ll work with Unity free until there`s some job that requires me to upgrade. The features of Unity Pro are awesome, of course. As well as Gamestudio A8 Pro is awesome compared to A8 Free / Extra. Its price is justified.