Thanks @_nicdean! These are good suggestions.
In fact, the first is already done 🙂 While not as clear as text might be, that rocket icon becomes disabled if the project is set to Software Only rendering. You can also click directly on that icon to open up the Project Setting and enable the GPU.
GPU disabled (left) and enabled (right) :


The suggestion for the expression engine is a good one as well. Though, to be honest, I personally prefer this idea to help reduce the usage of the
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