I’m quite allright with the different user interfaces really, I think they’re functional and clear. No need for fancy lights or silly colours, Cubase doesn’t have them either. It’s part of the Steinberg art direction I think, if Steinbergs plugs looked like Fabfilters they would be way off in my opinion.
Not to say Fabfilter makes bad plugs, just their art scheme is rather shockingly different from Cubases