The OP is not the first person to ever bring this up....

I would file a ticket on it and ask for the pane back.

The addition of Superfly was never meant or supposed to change Firefly at all. It obviously did......

What the OP has stated shows without a doubt that it did change it for many users... And if it alienated one, it will alienate many more that never say a word...

It is true that the simple material section didn't work properly with Superfly. Neither do the Firefly render settings, and they remained unchanged.

There is room for another tab, to retain Firefly the way it was in the past.

It was a choice to remove it. An odd one at that....

Nothing can remain the same, when you remove part of it....

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