I think you’re right about not needing the black roof with the Verdant Green, as the colour is already dark.
I read someone had spoken to one of the long-serving Lotus staff at a dealer event and he had seen the Verdant car currently being built. He said it didn’t have black pack and didn’t need it.
The other factor to consider is the other elements of black pack and how they’d work with the rest of the car. Door mirrors are half black/half body colour without BP or all black with it, so work either way.
BP also adds black tailpipes and rear LOTUS letters, which are silver without BP. If you’re going for silver or diamond wheels then leaving these silver works well and provides some accent details. If you’re going for black wheels then black badge and tailpipes would fit the dark look.
If you don’t add black pack then you can do some/all of the black parts afterwards anyway.
I do think it’s actually hard to spec a bad colour scheme on the Emira. Go with what you’ll enjoy rather than be swayed too much by some people on the internet