For a roadster that wil spend most of its time on the road, i'd say if you spend some time getting the set up right you won't need them. From recollection Lotus try to use the smallest bars possible on their roadcars..
For a track car adjustable bars are really handy, especially swapping from a dry set up to a wet set up and making tweeks to the under/oversteer balance.
I'd tweak spring rates, front/rear ride heights and damper settings to get a setup I'm happy with for the road, if that still wasn't good enough I'd consider fitting some.
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